[jediraverz]

Okay so I got the Durso standpipe, set up my 1 return Mag 18 to 2 outlets, 1 1 1/2" bulkhead for drain, when the water starts going the water level starts changing.
First its high in the overflow, then it reduces and the level in the sump rises, then keeps going back and forth.
Does this have to do with the hole at the top of my standpipe?