Fill a mesh bag full of them and put it in a river for a month then soak in tap water with a touch of bleach for a week to kill anything living on them. Dry them out and Bob's your uncle...
Chris~ Thanks for the bump... I'm actually placing this order today or tomorrow to have it coincide with the inverts... The BAF discs are made of ceramic and not aragonite, and therefor don't affect pH... But that supports some of the findings I've had in the past...
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