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

Like all of the Fluval filters I have bought the work awesome and take the pain out of cleaning the filters and tank regularly

easy to use, perfect fit in filter, effective

A bit expensive

Thnxs

Buy these not the white ones. The whites one get flat and clog up the canister, thus slowing Dow the out put of water back into the tank.

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

Fit perfectly in my fx4 and made it look like my fish we’re flying in the tank

Threw these on my top rack along with some carbon. Works amazing in my 150 gal Tank. Racks: Bottom: Bio Rings + 3 Fine Filter Pads Middle: Bio Rings + 3 Fine Filter Pads Top: 3 Bags of Carbon + 3 Fine Filter Water Polishing Pads

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.

Works perfectly for my cannister as it should! I have not taken a chance on off-brand replacement media so I dont have much to compare to but obviously if you want direct fit and replacement, this will accomplish it.