Used sump question

I picked up a used sump for cheap recently and am having problems getting the flow right. The sump is a del ray model 125 with a grundfoss quiet one pump, the pump has no markings on it does anyone know what the gph for the pump is? For what i have found looks like 900ish at 4' of head, what size bulkhead do i need to run to it? I tried 2 3/4" but the sump goes dry before enough water returns, any help on pump size and which bulkhead to use would really help.
Thabks


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ascarbo27 said:

i had the same prob, you have to get the water level higher in your tank or overflow box lower in water

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I havent installed the overflow box yet still working on drain sizes, i want to make sure i have flow correct before i install the box.


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DIDYSIS said:

Most drains are always in the 1-2inch range. How large can you go with the drains? Sounds like you might have to setup your system a little different if you cant have large enough drains to handle the normal flow with stand pipes. Full siphon method would net you more flow.

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I would say 1 1/4" would be about the max drain size i can go up too, and what is full siphon method?


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