Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239

(1465 Reviews)

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$12.99

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(80000 available )

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135 Ratings
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Reviews
  • Ken J.

    > 3 day

    I have an FX4 needs 4 pads but box only comes with 3. If you need 4 pads than include 4 and charge a little more money

  • Heather

    > 3 day

    Theyre ok, I guess. I noticed a SLIGHT improvement in my water clarity. I have 4 fancy goldfish in a 110 gallon and I feed Repashy Super Gold, so my tank is pretty messy. Im running an FX4 was unhappy with the clarity of my water. I put a fresh water polishing pad in the filter weekly and rinse out the old one to re-use. The pads are not very durable and Ill probably only get 2 uses out of them before they disintegrate. They are fairly inexpensive though, so I MIGHT buy them again...I dont know. I ended up adding a separate water polishing filter and some Purigen and my water is finally clear enough to satisfy me.

  • Vee

    > 3 day

    Fits like a glove nothing better than original

  • Ziggnick

    > 3 day

    Works great I have two red eared sliders and a few fish in a 120 gallon tank, I use 2 of these filters in the top basket for getting the big stufd before moving onto my bio rings... My turtles are very messy eaters missing half the food they eat I swear and with this high output of a canister these keep right up with it, I use two of these in the top tray with carbon sock under them then middle tray is loaded with almost 3 boxes of bio rings, and bottom tray with 1 1/2 boxes of bio rings on top with 2 white pads (filter floss) on the bottom mainly to catch particles off of the biorings which put off ceramic sand for the first 2 months or so, I use the white ones now to keep my water crystal clear....love the pump.and.these blue pads! Ps... There is another seller on here who I have found that sells these in a generic for almost half the price same size thickness and structure just half price and without fancy boxing highly sugjest saving the few bucks ;-) have a good one

  • Joseph

    12-06-2025

    Buy off brand. I read reviews for others saying they were a tight fit and smaller holes. I bought these and they fit tight in FX4. They will do fine since they are made for the Fluval but next purchase will be another brand so I can save money.

  • mytoocentz

    > 3 day

    They do as described. The aquarium is crystal clear. Thanks so much.

  • FD Firefighter 121

    Greater than one week

    I was unaware of polishing water until I got my Fuval 206 canister filter. This is way too big for my canister (my bad) but I took scissors to it to make it fit. Water is very clear. The polisher does get mushy after a few months but no big deal to swap it out for a new one. Once this supply runs out I will look for the polisher specific to my Fuval 206! If none, it is no big deal to cut to shape.

  • Mary

    > 3 day

    Excellent product. Just what I expected of Fluval.

  • No Name

    > 3 day

    It is good and works perfectly fine in my FX5. It is a bit expensive though! It comes in a nice box but I dont mind buying the foam pads in a cheap bag if this would lower its price. Im throwing the box in the trash anyways.

  • Nykee

    > 3 day

    A week after putting this filter in my FX4, turtle tank, I noticed the tank water was very dirty. Then noticed the flow was very low. The only thing I had done differently was change the Bottom black basket pad to one of these pads. So I checked it out, and the new pad was now FLAT and HARD! Nothing could pass through that! I wish I had taken a picture for this reveiw. Im pretty shocked at what happend. Ive been using the FX4 for a couple years with no issues. This pad says its compatible with the FX4 right on the box. There is No reason this should happen. I have to believe these are fakes, with material that isnt even appropiate for a filter.

Fluval Bio-Foam performs double duty as both an effective mechanical and biological media. It is specifically designed for use in Fluval FX4, FX5 and FX6 High Performance Canister Filters. Bio-Foam provides outstanding mechanical and biological filtration thanks to an intricate pore structure that offers a large surface area for nitrifying biological activity. In addition, it trap small particles that are not retained by the first stage of foam filtration.

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.

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