Piping configuration

[daplatapus]

In the corner where your emergency drain is, would there be any flow other than that going into the top of the overflow? My "over think it" mind makes me wonder if you wouldn't get water stagnating in the bottom of that overflow if there isn't.

[albert_dao]

Well, there's the problem wherein the one side where the E-drains are won't get proper flow through.

[mark]

Have my main in one overflow, emergency in another and works okay.

Running a trickle through the emergency but was also worried about going stagnate so drilled a 1/4" hole high on the standpipe, threaded in a elbow with a line going to bottom. Not sure if may a differance but my tile fish went AWOL for a month and just got fatter in the e-overflow.