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

They fit in the canister filter perfectly and do a great job at filtering out the junk all while providing great places for biological filtration. and plenty of it.

It’s good

Ive been using this carbon impregnated foam pad in my Fluval FX6 for 2 years now. My aquarium water is always crystal clear. I change out the pad once a month and add some loose carbon into a knee hi and tie it off at the end and trim off the extra panty hose. A box of 10 pairs costs a few dollars and gives me 20 aquarium bags for added carbon or whatever I need to add. Ive been using the Fluval Impregnated foam pads and they work great but have never tried the cheaper pads that dont have a name but come with a bunch for cheap. I cant speak for any other pad but this here Fluval. I always believe that you get the quality that you pay for. If this review was helpful to you in any way, please let me know by clicking on helpful. Thank you so much!! :)

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

Works well in my FX6. No complaints.

Good fit for my fx6

These work wonderfully in the Fluval FX5 - a long time ehiem fan for over 35 years Ive been using these filters for larger tanks (up to 300 gal.) in pairs and theyre incredibly effective especially for messy fish. Of course, nothing polishes the water like a Vortex Diatom Filter which can filter out debris and pathogens down to one micron in size but these are supplementary filters meant only to be used once in a while. These pads although not as effective will remove particles down to about 10 microns. I run four FX5s and replace these about every 60 days. Like the white foam which is for coarser debris its imperative to replace them or your GPH will suffer and the re direction of water flow not being able to pass through can result in ahigher degree of bypass - an inherant problem with the FX5s in general. These do keep your water on the pristine side and the value on Amazon is excellent.

same as store

Use this product all the time for Clearwater I. Fish tank!

work perfect, but overpriced. Ive since switched to the off brand version which is also sold on Amazon and gets you 12 foam blocks for not much more than I paid for 3 here. I spent years swearing to use on the Fluval foam, but after finally caving and switching I can tell you that replacement foam works every bit as well for far less money.