I wasn't thinking of using it in the tanks, but rather as a
pre-treatment. We had a breeder give a talk at our local aquarium club,
and that's what he does. Has a series of 4 canisters filled with
carbon, and runs his tap water thru them and right into his tanks.
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"I wrestled with reality for 36 years, and I'm happy to say that I
finally won out over it."
---Elwood P. Dowd