Through trial and error, I found that these replacement sponges did not live up to their promises. After using them for a couple of weeks, I noticed that my aquarium water was still murky... I even tried using them in different types of filters and aquariums but they still didn't work. The only positive thing I can say is that they were easy to install. As a buyer of Pet Supplies, I do not recommend this product for your aquarium..
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