Tondiamo 3 Pieces Aquarium Sponge Filter Pad Media Cut to Fit Foam for Fish Tank Filters Replacement Fish Tank Cleaner Open Cell Foam Sponges for Dishes

I purchased this foam to use in my emperor 450 hang-on-the-back style filter, in conjunction with my media holding baskets and ceramic rings down the main pickup tube tray. Between the ceramic and open cell foam media there is plenty of area for biologic filtration, and in separate sections so you can clean them in waves and not knock out all the beneficial bacteria like when doing them all at the same time.The media does an OK job at trapping the physical debris during its mechanical filtration, however i prefer to throw a smaller cell filter before that i pull out more frequently and wash off to get the bulk of the junk while leaving the larger cell foam to focus more on biological filtration.The last element you are missing from the over-priced cartridge filters is the chemical filtration media included in the cages behind the floss layer. The 400/450 models i own offered cages that could fit behind the filters, which i use on one or both sides to help get some flow over carbon or whatever other media i am running (maybe after a medical treatment or whatever) and when not in use i just slam another wedge of foam in there. The smaller ones i just get a filter bag, throw some of the carbon pellets in there and drop that on top of the foam part for the final stage in the smaller tanks.Overall, its just a hunk of open-cell-foam but with a bit of handy work and an open mind this could save you hundreds on OEM and store brand replacement filters you just throw out once you are done with them. Just google around about making your own fishtank filters and there is a wealth of info - just remember to start simple and expand from there and you will do fine!Cutting the material can be tricky, and the sheet provided is large enough to make a few filters but not huge by any means. I got about 6-8 filters out of the single sheet which ranged from my larger emperor 450/penguin 400s down to some blocks cut for my smaller 10g fluvial filters - even have some in the submerged power-head type filters in the cichlid tank!In addition to the mechanical and bio

This was perfect for my fishtank filter.I was spending a lot of $ for filters this was less $ and worked great 👍

Cut two to fit in by aquarium filters, works great pull out and rinse and replace, very good way to save money on filters.

Comes vacuumed sealed and very misshapen because of that. Soaked it in some warm water for a few minutes and it was perfect.

I rarely write reviews, but there were so many bad reviews for what is actually a great product at a great price, I figured I should. Yes, it looked misshapen when it arrived, because it was in a vacuum-sealed air-tight package - that’s a good thing, it means what I’ll be sending my aquarium water through is a clean product which’ll help keep my tan water clean. Soaking each in a pan of water for a few minutes, as described on the listing, restored them to their expected glory, ready to be cut to fit for my several filters. Exactly what I hoped for.

Remember to soak it in warm water for a few minutes so it can expand to its normal size. I used this as an air intake media filter for an air compressor.

It was delivered in air sucked package to reduce weight and volume which compressed all sponges and became about 0.25 in thin.

I messed up the little filter that was in our bird bath fountain. This filter worked great just needed a small piece of the filtrer so I will have plebty for a long time. It arrived in a vacumm sealed bag and when opened it takes a couple of days to re-inflate itself back to normal size. It worked great for what I needed.