Quote:
Originally Posted by Dez
Yes, however it's not so closed anymore once there is a drain in the overflow. Take a look at this diagram that I quickly mocked up (white box is the pump) If you have a power outage, the whole tank is going to drain to the level of the standpipe (standpipe drains to sump - I didn't continue it in the diagram). The water is going to go through the return at the bottom of the tank, into the overflow, and drain down the standpipe in the overflow box. Meaning in the case of this diagram, almost half of the tank would be drained to the sump. Please correct me if I am wrong, but I think that I've thought it through alright in my head. Mr. Alberta said that this exact thing happened to him so he doesn't run the inlet of the closed loop in the overflow box anymore.
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If the white Box is a closed PUMP, not a SUMP, then No water will drain. Only will it drain if there is a leak in the plumbing. Then no matter what design you have. In a power outage with this design, the level in the Overflow will ballance the level in the tank. Nothing will over flow. It can't.
Now, when you ADD a sump. You need to make sure the sump can handle the extra water in a power outage, because it WILL drain from tank to SUMP, because the sump is open. It will drain the tank and overflow to the sump drain pipe level, thats all. Mine does this JUST FINE.
You will need to use a Durso style drain for sump in the overflow though. Thats the only caveat