Dr_Shakalu;1929124; said:I bleach some of my filter media sometimes, like the polisher in one of my canister filters. What I do is after I bleach them clean I soak them in clean water and add water conditioner that removes chlorine. Remember, bleach is chlorine so I add conditioner to the container I put the media in to get rid of the chlorine. If I put the media in a 1 gallon container after I bleach it, I put 2 times the amount of conditioner in the 1 gallon container. I've never had any problems after. The Doctor.