Surge tank experience?

[danny zubot]

I can see how these designs would create bubbles. I think the size of bubbles could be adjusted by using a larger sized air line. (#3 above) This would make larger bubbles and thus rise out of the water faster.

I thought about trying a flapper style surge, but mechanical parts = more room for malfunction. The design used at Waikiki soesn't use any moving parts, so if I can get it working it should stay working.