I have an Eheim Pro3 canister filter and it's a bit big but very easy to cut. Great filters. A bit pricey in size but especially the blue one seems to last a while. The blue one has been in my filter for a good 5 months now and doesn't need to be replaced anytime soon. I used 3 of the 4 white filters but I added a 30cm Pleco which made my aquarium very dirty. All in all great filters!
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