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

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.

works on my fx4 thank you

Its a good product. Good for the Fluval FX5. Very dense filter. Cleans the water very well, but only downside is that it clogs quite fast. Not very fast, but it will clog and stop the water flow eventually. Thus you need to replace the filter pad a lot. It cleans the water better then other pads or filter floss. But, I am trying filter floss now instead of this so I dont have to replace the pads so often. Also, theyre difficult to clean out because once theyre dirty then its pretty much impossible to clean them and its better to just replace them.

Works for my fluval FX4 but the package was smashed. Filters themselves were ok because they are soft and the material sprung back. Amazon needs to package this item better i.e. in a box not a soft envelope. Also the ratings included Noise level and suction which makes no sense for this product.

Used it in my Eheim 2015 classic and it worked great and my water is crystal clear. My water turned cloudy since I started using my 2015. But after reading forums added a pad of these to my filter, a whole different ballgame. My fish were so happy I guess they started crossbreeding( Fantail and a blackmoor) and laid hundreds of eggs seriously after a week of having these lol.

I use these to clean the sides of my aquarium walls. They work great for cleaning both brown and green algaes off of the glass. I dont know what I would do without them - they work better and are safer than any other sponge or cleaning pad that I have seen.

Excellent product as described..... timely delivered

If you have a FLUVAL FX5 then you are familiar with this stock part. If you are buying an FX5 for the first time, or have recently purchased one; use this stock replacement foam for at least the 1st six months. There are great mods for the FX5- but get a feel for the quirks of the filter before tinkering :-)

Lasts forever

Aside from the white coarse pads surrounding the trays, I run two of these black sponges wavy side up in all three trays and thats all. I detail my fx6 every six months and it handles the bulk of filtration on my 125. I also run a HOB for supplemental water polishing