I have been using Chemipure in the canister filter of my aquarium for 27 years. My canister baskets are large and require two bags in one basket. After three months I will clean the canister filter and only rinse out two bags and after three months I will replace two bags and repeat the process. My aquarium is a 50 gallon freshwater tropical tank that uses a canister and in-ground filtration system with weekly partial water changes. I have to tell you that my water is pristine! My fish are healthy and active. Visitors often comment on the cleanliness of the tank. And it never smelled. I've only used Chemipure so can't comment on other products but I'll stick with it based on the quality of the water I have. I highly recommend this product.
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