Works well. That's a good value. I was able to crop it to size to fit my filter. (You may know that sponge filters are way better than cartridge filters where you get rid of good bacteria every week.) I've only had mine for about 2 weeks so I can't comment on how well it's holding up over any period of time, although this sponge does is large enough to be used in multiple filters. (probably 4-5 of the ones I use it on)
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