Gurgling POC overflow

[mark]

well in a skimmer salt behaves different than fresh so maybe so with a Durso.

Either when tuned my Durso, started with the water surging and gradually enlarged holes until the surging stopped, but still a little noisy. Kept going bigger then all of a sudden, quiet.

With each 2" Durso can fairly quietly flow between 500 and 1000gph and the hole size is only slightly bigger than 1/8".