FluvalFX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239

I will always use fluval products in my aquariums and especially in all my filters. I recommend not putting off brand products in your filters. Very good value for the money!

Works fantastic, tank is crystal clear.

Well if you have seen any of my review's about Fluval or Seachem product's, you undoubtedly will come to a conclusion that I only use these 2 product's & I buy in bulk for the best price. Why? Because they work plane and simple, I have seen the off brands at great price's and even gave them a shot, while the off brand does a good job, I found that at least in my setups (multiple very large tanks and heavenly stocked Cichlids African and SA/CAs which are very very large and messy fish) the off brands clogged up a bit faster. I am a fantic when it comes to maintaining my tanks. I run a total of 5 Fluval FX6 filters (2 in my African 135 and 3 in my 220 CA/SA along with 3 Fluval FX4 in my other 3 tanks from 30 to 90 gallon) These polishing pads really trap and polish the water combined with The Blue Fluval pads and water is crystal clear giving the illusion my fish are floating on mid air. These filter pads work in many other canister filters as well with very little effort. Bottom line if you run any of the Fluval FX series these pads are a must and ate worth every penny!

It works great for my fluval FX2 filter. I have no issues. It came with my unit when I bought it new. Just needed to be replaced.

A hardcore ehiem fan for 35 years, it was a slow progression over to the FX5 of which I now run three. The filter are beasts especially if you keep messy fish you see the pay off almost immediately. Still an ehiem fan and swear by their build quality but when you can you buy three FX5's for the price of one 1200 XL - and that's without media it's a no brainer.They both have pro's and con's I find the FX5's far too dependant on mechanical filtration, when those pieces of foam load up with gunk not only does your GPH suffer but water parameters become unstable. In an established tank there's enough nitrifying bacteria in your media and substrate to maintain the delicate eco system in your tank.The foam however should just be tossed and replaced. Keep in mind it takes TWO packages for a complete foam change. Hagen which owns Fluval has been notorious for decades in over hyped non certified flow rates, the push for replacing and selling media and positioning products like a simple replacement foam which leads the consumer to think it's an all inclusive deal. Why they don't give you all the foam you need and up the price or vice a versa and let you know up front only half of what you need is included.Thank's to a another reviewer I knew to order two packages per filter X 3 - you do NOT want to leave half of the dirty foam in your filter. Clogged foam only increases water bypass, trapped air and a significantly reduced flow rate.Aside from that, the foam is good quality. If I had the patience I would simply buy my own foam sheets and cut it myself. I do the same with 800 micro polishing pads but for me it's not about saving a few dollars and everything about crystal clear, pristine water.The price on Amazon is by far the best I've seen. I added a few boxes or blue and white coarse and fine pads and the total with 2 day Free shipping via my Prime membership was under $100 - about a 20% saving over the big aquaria e-commerce sites.

Fits and workd for the fulval fx4

Fluval FX5 is an amazing filter for my aquarium. The fine filter water polishing pads help clean my water for my fish. Items are as described.

works as advertised