DWC

An air stone won't kill bacteria. Don't know why you were told that but that's not correct.

Quote:

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Originally Posted by khyberkitsune

But that's for an aquarium, not a hydroponics system. You're not adding heavy amounts of calcium, magnesium, and in many cases silica to an aquarium.

Silica + magnesium + calcium + oxygen will eventually = clogged air stones.

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True, but it was sitting on the bottom half covered with goldfish poop. :D