DIY overflow question!!!!!!!!!!!!!!!

slowlyburn · May 22, 2007

The intake tube where the water gets drawn out of the tank. Is that supposed to be completely under water? I am using 1 1/4" pvc and only a 450gph pump but my tank overflows the top rim. the overflow cant keep up... I set the height of the overflow intake to have the water level cover about half of the intake opening... I'm thinking it has to be totaly under water? Also I had to drill a higher hole cause when I kill the power my sump almost overflowed due to how low the outflow is in the tank... THANKS FOR THE HELP!!!!

ethnics · May 22, 2007

ur intake is to high, it has to be basically completly submerged to be at full potential flow. and dont forget to prime it completly to get all the air out.

rallysman · May 22, 2007

with mine the top of the PVC was even with the water level.

slowlyburn · May 22, 2007

Thank you, both of you!... I thought that was my problem... I'll update if I have any others...

Euge · May 22, 2007

i kind of agree with what is being said. The water level on my overflow changes from just above the bottom of the intake elbow to a good 2 inches above it. I think its called bounce

slowlyburn · May 22, 2007

I think i used to thick pvc for my pump... I only have 3/4 of the intake submerged but its running good. Its kept a steady level for a few hours now.

ChrisG23 · May 23, 2007

Just remember, the lower the intake is in the tank, the more water that will be on the floor if your power goes out. I think 1/4 to 3/8 of water above the intake is probably safe. Ofcourse this depends on the size of your sump.

schaadrak · May 23, 2007

Why not have your siphon empty into a overflow box that has a standpipe set at whatever level you want your water at?

Sort of like this:

That way you can have your siphon as far below the water line as you want. And if the pump stops the water only drains down to the height of the standpipe in the overflow box so your siphon won't break.

slowlyburn · May 23, 2007

My power going out is not a problem... The sump is a 55gal drum so it can hold a few extra inches of water when the power is out. The tank will only drop as far as the intake. I fixed the outflow problem by drilling a breather hole above the waterline.

JustLooking · May 23, 2007

slowlyburn;876323; said:
I fixed the outflow problem by drilling a breather hole above the waterline.

Where at,in the overflow piping?
Will it restart on its own?


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