DWC

[polishpollack]

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

[StoneMeadow]

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.

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