I need advice please

[banditpowdercoat]

Tank drains into sump.
Pump in sump pumps back into tank.
You need to keep a level in your sump that if the power goes out, and pumps shut off, the tank will only drain so much, and wont overflow the sump. This is acheaved by such means as a siphon break, or just the weir level of your overflow. When you first fill up the tank/sump, I fill TANK untill it overflows into sump. When sump is full, and no pumps are running this is the "Power OFF" level. tank is full, and sump is full. Now fire the pump up, and the pump will pump sump into the tank. Tank will then drain into sump. The ballancing act is not to pump more into tank than is draining back into sump.