I have a overflows on each end of my tank each drilled for 2" drains and current running Dursos. They're fairly quiet but know a Herbie would be quieter.
Have thought to convert to a modified Herbie and see no reason it wouldn't work if left one overflow at it's current height, do a straight standpipe with the gate valve near the sump. The other overflow I would raise the height of the lip (thinking I could go up ~3/4") by siliconing glass pieces inside the overflow chamber. Only negative is the volume the basically empty chamber takes up.
I have thought about just removing the second overflow chamber entirely and just running a straight standpipe up from the bulkhead for the secondary drain, having it slight above the display water level. Problem with this for me though, is one chamber has the intake in the side for the CL, the other chamber the return line runs through it.
|