Hipanda Filter Foam Sponges, Bio Sponge Filter Media Pad, Cut-to-Size Foam for Aquarium Fish Tank 7.5" x 4.7" x 2.75"

Highly compressed and took almost 2 weeks to return to stated dimension. Looks like it will work great as a replacement filter for a pump that I can no longer find replacement for.

It arrived flat, in a vacuum-locked package, very surprising! It expanded perfectly in a couple of days just by sitting on my counter. I'm using it around the pump in my outdoor water fountain, to keep the bigger leaves and such away from the pump. I bought the 7.5" x 4.7" x 2.75" and that is exactly what I received. I cut it to fit my pump with an x-acto knife and was easy enough to cut through the thickness. I will be ordering another one as I cut this one incorrectly (I should've measured twice and cut once), but it is exactly what I needed. I installed a simple $10 float and water supply hose to the fountain, so that I don't have to keep refilling it. I put the extra piece around the float to help keep debris away from it.

Bought this to use to fabricate a new foam air filter for my Devilbiss 6.5 HP air compressor. Cut to size and installed just fine with sharp box cutter. Same exact material as the old filter which was beginning to break down and decompose into pieces... Works great... Not what it was intended for but its the same stuff and works just fine. I recommend...

It's foam

It comes about 1/4" thick. Instructions say it takes 24hrs to expand. 72hrs later and still 1/2 as thick as ad says it is. Finally got it wet and stuck it in the microwave and presto, proper size. I get shipping is cheaper squished but if you're in a hurry, this isn't for you.