[pescadero]

Originally posted by hahnmeister
The dual standpipe method works better, FWIW.

You use a primary standpipe (no durso needed) which is shorter and has a valve all the way at the bottom outlet to 'back up' the water. This prevents the noise, bubbles, etc by adjusting the water level in this pipe. Then, you have the backup drain plumbed normally, with a standpipe that is taller than the primary. This is the backup/safety should the primary get clogged or need adjustment.

Its silent, its easy, etc. Much better than any stockman, durso, etc.

On my secondary, I utilize a 'S' trap to keep the water from falling more than 12" at any given time.... kind of like a weir or levy system to slow the water down and prevent bubbles.

by any chance would you have a diagram? your drawings are always outstanding.