These filters work very well. I use them for our Booda Dome cat house and also for our upstairs cat house that looks like a large terracotta planter box. The pot has room for a filter at the top and they are perfect because they are round and all I have to do is poke a hole in the middle where the artificial plant stems go through and you are done. They work much better than the cheap foam "filter" that comes with it!
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