Do I need a valve on sump plumbing?????

[windcoast reefs]

Originally Posted by monocus

i would probably go with a bigger drain.i'm using a stockman with a 2" drain

Thats pretty much impossible for me to do. I already have the largest bulkhead that I can get for the hole. And I can't drill it out anymore without affecting the structure of the tank.

I can maybe step up to a larger pipe ( 1 1/4" or 1 1/2"), but I don't know if it is a benifit considering the bulkhead restricts the flow.

[windcoast reefs]

Originally Posted by mark

drain size from RC (gravity)

Beananimal's siphon calculator

I used the calculator that you showed, and it seemed to back up the size of the pipe and the flow rate. So So far it seems like a 1" pipe will work for me with a valve on the return.

[bignose]

You could also put a valve after the return pump to control flow rates if you don't want one on the drain.