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One way around that if you don’t have enough headroom in the DT to accommodate the contents of the sump return chamber would be to make a “snorkel” for the pump with pvc so it pulls in water from higher in the return chamber at a level that won’t overflow the DT.It all depends on how you set it up. A properly set up sump will never overflow when you shut the return pump off. I would
be more concerned with a drain clogging and having the tank overflow from the top... which is also impossible if your sump it set up so that it empties the return pump chamber before that happens.
So on a 40g breeder with a 20g sump, all I would need is a check valve?
I guess I have some math to catch up on.
That’s a pretty slick little method there. It would actually provide some adjustment too.One way around that if you don’t have enough headroom in the DT to accommodate the contents of the sump return chamber would be to make a “snorkel” for the pump with pvc so it pulls in water from higher in the return chamber at a level that won’t overflow the DT.
So on a 40g breeder with a 20g sump, all I would need is a check valve?
I guess I have some math to catch up on.
Yup. Exactly. Put a check valve on your return line placing it vertically. And you are good. The water won’t back siphon. Overflow will empty out in the sump. And that alone won’t overflow your sump.
in addition you the check you should drill a siphon break in the return in DT just below the water line. It’ll keep a back siphon from happening in the event your check valve gets stuck open.And it won’t flood because once the water line is below the overflow It will stop siphoning. The light bulb just went on.
I was looking at building my own so I learn. It seems so much cheaper than buying one.