
This is a charcoal that helps remove odors. We sprinkle and mix some with kitty litter and it really helps. So not just for your aquarium filters! As far as I know it's non-toxic and better for cats than the scented powders some people use to mask stinkers! This can cause a number of problems with a cat's respiratory, eye, ear, and nose.

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EcoBio-Block Stone: Natural Water Clarifier & Odor Remover for Aquariums (Medium) - Treats 15-40 Gallons Efficiently
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Tetra AquaSafe tap water treatment agent, 5 l
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