I am using a canister filter in my 50 gallon aquarium for the first 6 months. I'm just getting used to different types of media and how they clean the tank. This range seems to hit the highlights of everyone. Today I cleaned my filter and put this new medium in place. I had to rinse it about 2 or 3 times before it stopped releasing dusty dirt residue. It perfectly filled one of the trays I had and I took it out of my pocket. Inside was also an odd little pouch of activated charcoal that fell apart when touched, so I'm not exactly sure what it was for. It was in a plastic zipper so couldn't be used until you opened it. There were exactly two Bioballs in the range. You can see how it compares to the others I already have in the filter. I'm not sure I like the design that much. Oh there isn't a very good selection unless you have special needs. Let's see how well it cleans the water, but I think it will do its job well.
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