14 best fluval aquarium pumps

Product description

The All-New 07 Series marks the 7th incarnation in nearly 4 decades of Fluval's top selling canister filter family worldwide. Not only does the latest generation incorporate the power and reliability you've come to expect from the leader in aquatic filtration, but it also features several new performance upgrades that make it up to 25% quieter and more robust, energy-efficient, flexible and easier to use than ever before.

• The 07 series features new engineering solutions that work cohesively to produce a fluent operation that is up to 25% quieter than before
• Depending on the model selected, the 07 Series generates between 145 - 383 US Gal/h (550-1, 450 L/h) of constant pumping power and pressure that endures over time
• 07 filters are big on power, yet small on energy consumption. The 107 and 207 models, for example, draw as little as 10 watts of electrical energy, which is EQUIVALENT TO A SINGLE HOUSEHOLD LED LIGHTBULB!
• The 07 Series features several new design refinements that reduce the effort and time involved for maintenance, so you can spend more time enjoying your aquarium, and less time working it
• The 07 Series utilizes every square inch of available canister volume, and positions media resourcefully to maximize media space in a compact footprint

User questions & answers

Question:	whats the inner diameter of the hose
Answer:	it is a small tank because it is divided holds about 2 gallons of water for the entire tank
Question:	is it 50hz or 60hx
Answer:	They take the aqueous 2000 deluxe replacement cartridges
Question:	What do you have to do to clean/replace material on the inside? Better than the cleaner that sits on the back of the aquarium
Answer:	Most tetra species get more than 1.5 inches each at adult size. Some species of tetras getting up to 4.5 inches adult size. Putting tetras in this small of a tank is not recommended, because it will stunt them pretty bad and will shorten their life span. Professionally we recommend tetras to be in no less than 10 gallons. They do best in schools of 4 to 6 or more and need to be kept between 78-80 degrees as they are prone to stress and disease if kept in cooler water. Avid tetra owner for 15 years. Just my two cents.
Question:	Does this filter come with a spray bar
Answer:	I have this tank and it’s cool but as soon as we went to clean is it was a mess. Normally I do a 20 percent water change and this makes u do 50. Also my bettas have hated the flow of the tank and I’m in the process of getting new tanks for all 3 bettas

Product description

A pump that can be used with either the EVO12, FLEX 15 or SPEC 16. These aquariums are great for any home environment.

• Usable with EVO12
• Compatible with FLEX 15
• Works with SPEC 16
• The Circulation Pump WP1500 is suitable for the Fluval EVO aquarium, 13.5 US Gal (52 L)

User questions & answers

Question:	what size tubing do you need to go with this
Answer:	It does not require any tubing.
Question:	does this item come with all parts or just pump
Answer:	Just the pump and the threaded fitting to connect to the tube. It does NOT include the tube and upper fitting even though these are shown in the image.
Question:	Is this pump okay for the fluval flex 9 gallon
Answer:	No it is not, it's way to big, doesn't fit in the fluval flex 15 gallon either...I can't find the right pump anywhere, please help.
Question:	How many GPH (gallons per hour
Answer:	I know this is an old question, but 132 gph

Product description

A pump for the flex 9 gallon aquarium. The replacement pump is what helps circulate water. This is for the Fluval flex 9 gallon aquarium.

• Wp500 Edition
• Excellent circulation
• Flex 9g exclusive
• Country Of Origin: China

User questions & answers

Question:	Does it come with the hose part
Answer:	No, the hose piece does not come with it.
Question:	Can this pump come apart for cleaning? Like the propeller when it becomes clogged
Answer:	Yes, I take it apart to thoroughly clean it.
Question:	Is this pump usable in the cube? approximately 5 gallons, i think 25l. i figured out how to get into the cube, just need to right pump
Answer:	Not really. It will move the water, but it is too large for a 5 gallon tank. I use my in an 80 gallon tank. I would suggest a WP200 pump.

Product description

Fluval Sea Circulation Pumps space saving size and innovative design provides many outstanding benefits: it minimizes tank intrusion, improves energy efficiency and delivers a smooth broad stream of ocean-like current. Unlike other pumps, this efficient circulation pump broadcasts output to assist corals with a gentle, indirect current. Fluval CP-Series circulation pumps provide a wide, gentle stream to simulate natural reef currents that make your tank inhabitants feel at home.

For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

• Simulates natural reef currents to make your tank inhabitants feel at home
• Compact-yet-powerful space-saving design minimizes tank intrusion
• Adjustable 270-degree directional flow for custom currents
• Secure, flexible mounting for easy installation and repositioning
• Energy-efficient, European engineered and manufactured circulation pump for use in freshwater and saltwater aquariums up to 50 gallons

User questions & answers

Question:	I have tons of big fish and I was wondering if I can use a cp4 model on a 75 gallon tank will it be to munch I got monster fish
Answer:	in my opinion i think cp4 would do just fine, i got cp2 on my 29 gallon saltwater tank and i got a decent amount of flow just right wouldn’t blow my fish away. I suggest you look for some review on youtube so you will have an exact idea of the flow.
Question:	does is work in 240 v
Answer:	No
Question:	Would this be ok to use in my 25 gallon salt water tank
Answer:	It depends on the amount of circulation you require for your fish and corals. Most likely yes.
Question:	I have a 75 gallon tank with really big fish just wondering if I use the cp4 model on a 75 gallon that is 48 inches across 18 tall will that be ok
Answer:	I have a 45 with big fish, I use 2 of these to maintain a steady circular flow (gyre) lengthwise on my tank. 36 inches across, 22.5 inches tall. My fish love it, but it moves sand into dunes. Gravel substrate is unmoved, so if you don't want a constantly shifting bottom, make sure you don't use it on sand on a small tank. Regardless the fish will love it and it won't overwhelm them. Personally I like the dunes effects on the sand as well, looks extremely natural.

Product description

Fluval Sea Sump Pumps have been engineered to deliver powerful flow rates at various head heights to ensure excellent water flow for sump equipped marine systems. These high quality energy efficient magnetic drive units can be plumbed in or out of a sump. Rugged and certified for marine use, these robust pumps deliver energy efficient quality. Fluval pumps run at a relatively cool temperature to avoid affecting the water temperature of the tank, whether running internally or externally. The Fluval Sea Sump Pumps are electrically certified for Marine use.

• Help ensure outstanding water flow for sump-equipped marine systems
• Powerful flow rates and head delivery
• Low heat transfer to energy consumption
• Includes barbed hose fittings
• North America: 120V/60 Hz/135W/Up to 3434 GPH

User questions & answers

Question:	Would this be too much for a 180 and a 55 gallon sump
Answer:	I had this on my 150 with a sump, and it worked pretty well.
Question:	Can this be used outdside of a sump? as a non-submersible pump
Answer:	yes you can use it either as a submersible or external pump and it very powerful and very quite excellent pump have there biggest model running my 400 gallon sat and no problems or issues for close to a year
Question:	Debating whether i should get this pump for my ESHOPPS-WD-300 CS. Anyone know whether this pump will be too much for the overflow box to handle
Answer:	No it is not. You can always use a ball valve in the output line of the pump, and one to control the flow from the overflow box, and fine tune the operation according to your water volume. The pump itself is very good. Hope that helped.
Question:	Can the output be reduced to 1/2 in. On the sp
Answer:	As long as as initial diameter is 1/2in inside you can reduce it.

Product description

Replacement AquaClear filter for the Hagen Fluval Edge 6 and 12 Gallon Aquariums. This is the same filter as the one that comes with Edge, except that it says AquaClear on the filter. AquaClear and Fluval are both Hagen brands. The media is not included.

• Replacement AquaClear filter for the Hagen Fluval Edge 6 and 12 Gallon Aquariums
• This is the same filter as the one that comes with Edge, except that it says AquaClear on the filter. AquaClear and Fluval are both Hagen brands.
• The media is not included

User questions & answers

Question:	How many gallons per hour is this filter
Answer:	I can tell you it’s designed for smaller tanks. I use it on my Fluval edge 6 gallon but is also used on their 12 gallon. It has the ability to switch from a lower setting which I use on my 6 gallon and full volume I assume is best for the 12 gallon.
Question:	This includes the propeller and all correct? I need a new propeller, but for $ thinking of just replacing it all
Answer:	Yes this filter includes everything. All you need is this filter and the tank, your good to go!
Question:	The picture looks like the aquaclear. does the edge tank use an aquaclear
Answer:	I believe they are one in the same, yes. It works great!
Question:	Can you adjust the flow,speed of filter
Answer:	Yes, from fast to very fast.

Product description

This filter/light cube with transformer, media and remote control is suitable for Fluvial chi 25L aquarium kit. This product weighs 1.2-pound. Measures 7-3/5-inch length by 4-2/5-inch height by 4-1/5-inch width.

• Honey comb fountain ornament is easy to install and maintain
• Fits Fluval chi 25L aquarium kit
• This product weighs 1.2-pound
• Measures 7-3/5-inch length by 4-2/5-inch height by 4-1/5-inch width

User questions & answers

Question:	Is it black or brown? I am looking for black
Answer:	It is brown
Question:	Would this fit the 5 gallon chi, or is it that much bigger
Answer:	It fits the fluval 5 gallon
Question:	What is the model number of this product? On my product it clearly says model number but I can't find anything similar in your details
Answer:	Sorry its been in the take for a few months but what is your specific need? Maybe I can help as I've bought several since the original one died and have learned alot about them.
Question:	Can this be used with the 5 gallon Chi aquarium? Thank you
Answer:	Yes, this is the filter that comes with the 5 gallon Chi aquarium.

Product description

Fluval U4 underwater Filter with three stage filtration is ideal for use in fresh, marine or reptile environments. Stage 1 foam removes large particles. In stage 2, the poly/carbon cartridge traps fine debris, improves water clarity and removes impurities. In stage 3, BioMax provides optimal biological filtration efficiency.

• Filters debris and provides optimal biological filtration
• Simple to install and maintain
• Silent and efficient
• Ideal supplemental or stand-alone filter, or for installations where external filtration is not possible
• Comes with 3-way flow control with adjustable output, 2 foam pads, 2 poly/carbon cartridges and 90 grams BioMax; Ideal for 34-65 gallon environments

User questions & answers

Question:	Will this operate with a 220 volts supply
Answer:	24"×12"×15-3/4" L×W×H...
Question:	Currently have a 10gallon but will upgrade shortly to a 30ish for a yellow eared turtle. Does this sit on the bottom where it could suck in the food and waste that collects on the bottom where my river rocks are? It has proven hard to get that out and the pleccu is not cleaning it up as of now
Answer:	I would try and refrain using saltwater setups for freshwater, although the filtration will not cause any harm to the water or your fish. The saltwater light provides high intensity (trying to recreate the sun) and may lead to algae and other pests such as diatoms, which make it a very hard hassle to keep at bay. Best bet if this is the setup you want to find a way to replace the light with some regular leds and save you’re self the trouble of constantly trying to fight algae and bacteria growth.
Question:	Can I change the direction of the water coming out of the nozzles? For example directing it upwards instead of horizontal
Answer:	The Fluval Evo V is designed for saltwater having a 11000K light and 3 stage filter, the spec V is for freshwater with a 7000k light. So it depends on what you want to put in the tank.
Question:	Does the U4 filter have space to add activated carbon pellets
Answer:	This tank does, but it's not the kind that uses bubbles. It's a simple plastic piece that comes in the kit that you attach to the water return. It causes the surface of the water to slope into the return thus skimming the surface. Fluval also made a protein skimmer that you can purchase separately that was built with this tank model in mind.

Product features

Fluval Underwater Filter

Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible.

• Designed for aquarium up to 65 gallons
• Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums
• Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature
• Position vertically against aquarium wall to create currents or customized flow patterns
• Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement
• Adjustable 3-way flow control – Top Output for circulation and oxygenation, Integrated Spray Bar for a gentle even flow, and Bottom Output for deepwater agitation

Product description

Fluval FX6 is a high performance canister filter with many outstanding features designed to make aquarium fish keeping easier and more convenient than ever. This super capacity yet compact canister filter has a pump output of 925 gallons of water and has a filter circulation of 563 GPH, which both work to produce cleaner and healthier results. Filtering material can easily be placed in a removable stack of media baskets, which is at the heart of Fluval's multistage filtration. The baskets are precision-engineered to eliminate water by-pass, making filtration more efficient. The baskets can hold a total of 1.5 gallons of media and can be stacked in the precise combination of layers that will work best for your aquarium. Each one is lined with a foam insert for effective mechanical pre-filtering. Instant-release T-handles let you lift and separate the baskets quickly and easily, making routine maintenance simple. FX6 also features Smart Pump Technology, which provides optimum filter performance. This advanced technological feature employs an electronic circuit board that continuously monitors the pump. Impeller speed and force are constantly measured to ensure power output and energy efficiency. It also manages the filter's self-starting feature and evacuates air that may enter or build up within the filtration system. On a 12-hour cycle, the pump will pause and allow trapped air to escape, ensuring the best filtration efficiency. Only 21" in height, FX6 fits under most aquariums. Fluval first broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

• Multi-Stage Filter that produces healthy aquarium water, freshwater or marine aquariums
• Features Smart Pump Technology for optimal filter performance, efficiency and management
• Self-starting filter-just add water and plug in. Head height (maximum): 3.3 m (10.8 feet)
• For aquariums up to 400 gallons

User questions & answers

Question:	How does this filter work to keep the surface water clean? I have used canister filters before and always end up with that film on top of the water
Answer:	Yes you can choose to use them, but put them in the bottom basket because the flow is sucked up and you can cut you flow rate when the polishing clothe gets sucked in up against water return filter screen. (I thought I broke mine then I took it apart and found my mistake). I use a foam pad versus poly fill tho and then just rinse it every month. And there is plenty of room for bio media on top of the foam and in the other baskets.
Question:	How is it's long-term reliability? I have had several canister filters in the last 15 yrs and all have leaked
Answer:	Yes you need at least 24" but 36 would be better. The connectors are app. 5" and the hoses are pretty stiff so they don't bend well. I have the same space in my stand and I had to cut out the back to slide it farther back and then I have to disconnect the hoses before I can remove the unit. I will get another stand as soon as I can. You also want at least 20 inches between the top of the tank and the unit.
Question:	I am sitting up a 75 gallons tank in my office i don't want to clean it a lot what fluval pump would you suggest
Answer:	Spec says.....80-160 US Gallon which pretty much speaks for itself. get the Fluval FX6 which has a much higher output and made for bigger tanks......even with this filter you need more circulation for a tank of that size. Most specifications are on the high end. I personally wouldn't go bigger than a 100 gallon with the G6
Question:	How is the longevity of the FX6 compared to other filters people have owned? (primarily Eheim). I will be using it in a turtle tank if that matters
Answer:	The water flow is not adjustable as far as I can tell. I have not had the need to adjust as the pressure seems optimal and I have three of these units on three separate aquariums, each with different populations of fish.

Product features

Fluval Canister Filter, FX6 Filter (400 Gal)

Designed for aquariums up to 400 gallons, FX6 is the high-capacity workhorse of Fluval’s canister lineup, enhanced with all the power and reliability you’ve come to expect from a high-performance filter.

• Multi-stage filter pumps out an astounding 925 gallons (3500 L) of water per hour
• Smart Pump – advanced microchip technology continuously monitors and optimizes pump performance
• Self-starting – just add water, plug in and Smart Pump will take over. Trapped air auto-evacuated every 12 hours to ensure maximum efficiency
• Easy water changes eliminate need to lift heavy buckets. Simply attach hosing to output (Kit sold separately) and Smart Pump does the rest
• Removable, stackable media baskets eliminate water bypass and hold a total of 1.5 gallons (5.9 L) of media

Features:

• All filter media included – mechanical, chemical and biological
• Aqua-Stop valves with leak-proof Click-Fit attachment system
• Valves positioned at convenient 45-degree angle for easy installation and rotation
• Anti-clog, telescopic strainer ensures continuous water flow
• Multi-Directional Output nozzles can be fully adjusted to create customized water flows
• Purge Valve with drain hose for easy maintenance and flushing of canister
• Rubberized feet help ensure quiet operation
• 21″ tall design – easily fits under most aquariums
• For use in freshwater and saltwater aquariums

Product description

Fluval Air Control Valve is a Fluval replacement part for all air pumps. This Fluval Air Control Valve helps your air pump work properly.

• Fluval Air Pump replacement part
• Fluval's 2 Way air control valve is suitable for all air pumps.
• Air Pumps help keep your aquarium thriving

User questions & answers

Question:	What size airline does it fit
Answer:	5/32” ID tube
Question:	Is this the piece that allows for the pump to be bellow the aquarium instead of higher up
Answer:	This piece allows you to cut the tubing, insert the valve on each end so you can control the air flow from the pump.
Question:	Is this the piece that allows for the pump to be bellow the aquarium instead of higher up
Answer:	No this only controls the air dlow. With this product you can send less air through the line. I believe you are looking for a check valve
Question:	do you control the air flow strength or is this only control on and off
Answer:	It is adjustable allowing control of flow strength.

Product description

What is a Fluval FLEX, EVOXII, or SPEC XV without a nozzle set? Absolutely nothing. Get the Fluval FLEX/EVOXII/SPECXV Nozzle Set and turn your Fluval FLEX, EVOXII, or SPEC XV into something!.

• Easy to use
• Great quality
• Improves overall wellbeing of the tank and fish inside
• Country Of Origin: China

User questions & answers

Question:	Will this fluval flex fit a waterbox
Answer:	No it will not, the hole on the cube 10 is 1/2” and this has a 3/4” connection
Question:	Will this work on a fluval FX canister filter
Answer:	No it will not. Too small.
Question:	Does this come with the tube
Answer:	no
Question:	Will this fit the corigated hose on the fx
Answer:	No this is far too small it’s roughly a 1/2 inch so the fx6 nozzle is far too big. Here’s what you’d need https://www.amazon.com/Fluval-Output-Nozzle-Performance-Canister/dp/B0017JJW8O

Product description

The hose is made of heavy-duty black plastic and is ribbed for added protection. The flexible filter hose includes an easy-on white connector piece at either end for a faster installation. The hose has a 14.5 mm diameter. Hoses arrive in the original manufacturer's packaging with any information and instructions that would normally be included.

• Performance driven at affordable prices
• Made in the USA with quality materials
• Field tested to ensure nothing but the best for your pet
• Length of Hose: 9.8 ft
• Fluval Replacement Ribbed hosing is suitable for: Fluval 307/407 Canister Filter (A446, A449), Fluval 306/406 Canister Filter (A212, A217), Fluval 305/405 Canister Filter (A211, A216)

User questions & answers

Question:	Will this fit for
Answer:	The only difference between the 305/405 hose and the 306/406 hose was the color of the ends.
Question:	How many hoses come in an order
Answer:	One hose long enough to cut into 2 sections one for the water in to the canister and one for the water out of the canister.
Question:	I have a Fluval fx6 up to 4oo gal, my hoses are around 5ft each two is this the right one
Answer:	It comes as one 9 foot hose with permanent attachments on each end. It is meant to be cut in half. It would be short for what you need if you require 5 feet each. It's great quality, but you would need to purchase 2 of these if you decide to buy it. Hope this helps in your decision.
Question:	Does this hose work with the Fluval 406 canister filter model
Answer:	Yes it works with both the 300 and 400 series

Product description

Fluval U4 Poly-Carb Cartridges has two unique filtering sides that combine to provide thorough chemical filtration, the crucial second stage in the filtration process. The polyester filter pad side filters out fine debris and contaminants. The carbon side filters out harmful liquid substances, colorants and odors. The Fluval Poly-Carb Cartridge helps keep your aquarium healthy and clean.

For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

• Chemical filter media with two unique filtering sides that combine to provide thorough chemical filtration
• Polyester side filters out fine debris and contaminants
• Carbon side filters out harmful liquid substances, colorants and odors
• Suitable for freshwater, saltwater or reptile environments
• Includes two cartridges designed for use with the Fluvial U4 Underwater Filter

User questions & answers

Question:	How often do you change the Poly/Carbon filter
Answer:	I usually go about 2 weeks before changing the poly carbon filter but I rinse the filters off every day. We have an underwater turtle and a lot of food particles are picked up by the filter
Question:	Does the u4 fit the fluval accent 25 g or the u
Answer:	If you have the U3, get that size.. it's available and the size I use.
Question:	Does this one fit 25 gal essentials
Answer:	Buy a bigger HOB... Waste of space for a smaller tank. I removed mine and my Fish are in a 135 gallon. Its really not a filter more of a polisher... KINDA...
Question:	Can this be used in the fluval accent 25 gallon filter
Answer:	I have a fluval accent. I used the u4 filter, the all poly one with no carbon.

Product description

Specifically designed for Fluval Spec, Evo and Flex Aquariums, Fluval Spec/Evo/Flex Activated Carbon provides effective chemical filtration, removing heavy metals, odors, discolorations and pollutants from aquarium water. The research grade carbon has large amounts of surface area for the adsorption of impurities. Fluval Spec/Evo/Flex Activated Carbon effectively removes heavy metals, odors, discolorations and pollutants, leaving your aquarium water crystal clear and sparkling.

For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

• Chemical filter media removes heavy metals, odors, discolorations and pollutants
• Premium, research-grade carbon with vast surface area for effectively absorbing impurities
• Help creates crystal clear, sparkling aquarium water
• Specifically designed for use with the Fluval Spec, Evo and Flex desktop aquarium series
• Includes three replacement activated carbon inserts

User questions & answers

Question:	Is it possible to cut a third opening in the middle for an additional biomax bag
Answer:	Yes you could but that would mean you would have very little mechanical filtration. There won't be enough media left to filter anything.
Question:	How often does the foam filter need to be replaced
Answer:	Not unless its falling apart, maybe every 3 years. You replace the charcoal every other month, the ceramic filter, yearly. Do rinse it monthly. These are the guidelines given to me by the tropical fish store I by my fish, and most of my tanks from.
Question:	i have Top Fin filter on my 20 gallon tank , well i really dont know where do i place this carbon
Answer:	The top fin filter cartridge product page says the design allows for addition of extra carbon or other filter media. I haven't replaced mine yet, so I don't know what this means. I guess you can add media to the cartridge by cutting a slit at the top. There is room for two of these cartridges. So I'm not sure if they are advertising that the carbon can be added to or replaced. I intend to replace the carbon every 4-6 weeks and keep the cartridge until it falls apart. To answer your question, I would replace the carbon with the same amount or more if it will fit in the cartridge.
Question:	Does this fit the fluval 13.5 gallon evo
Answer:	I use it with a 9 gallon fluval tank. It works.

Product features

Fluval SPEC Carbon Filter Media

Specifically designed for Fluval SPEC Desktop Aquariums, this premium, activated carbon provides critical stage 2 chemical filtration. The research grade carbon has large amounts of surface area for the adsorption of impurities. It effectively removes heavy metals, odors, discolorations and pollutants, leaving your aquarium water crystal clear and sparkling. This package contains 3 bags of activated carbon.