Hi Greg,
The tank needs an overflow to feed the sump. The return pump then feeds water back to the tank and it goes into the overflow at the same rate, returning to the sump. So the amount leaving the tank, cant exceed the amount being pumped into a tank.
Make sure the return is just at water level, so back siphoning is minimal when pump is off and make sure sump is large enough to handle any back flow.
__________________
Doug
|