Well firstly I don't use charcoal that much but over the year I've found that only 2 brands really do a better job, at least in my aquariums. When you need to remove drug residue or other contaminants, Seachem Matrix Carbon is the way to go. Throw it in an aquarium mesh bag and put it in the filter.
ACCU-CLEAR Water Clarifier for Freshwater Aquariums - Quickly Clears Cloudy Water, Ideal for Weekly Use
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