It is a flat 4 inch air stone.Now I like the way that air stone bubbles. You said it is 4" and is it one of those round flat ones?
Yes I had six running, two do not bubble as well but they are a different air stone material. Turned it off early summer, with the stream and waterfall did not really need it running.So you saying with 1 Ap100, you're running 6 4" air stones at same time? And all 6 bubble like the one in photo?
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