Quote:
Originally Posted by reefwars
maybe i missed it but do you have standpipes in your overflows?? this would keep your height set ,your gatevalve fine tunes the rest to a syphon ,trying to tune a herbie wthout standpipes and just the overflow boxes is a losing battle imo.
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I did have standpipes, but all they do is set the minimum water level, and if you hit that, it makes an awful sucking noise. The second time that happened (as one overflow filled up and the other emptied), I took them out.
And the emergency drain is a totally separate drain. I have two overflows, with two holes in them each. The south end has an overflow and the return, the north end has an overflow and the emergency standpipe, which goes straight down to the third chamber in the sump