Please drain the water out of that sump until that stand is rebuilt!
Every return I have ever seen entering the tank has been 3/4 but it doesn't need to be 3/4 the whole way. I would run 1.0 then within a foot or two reduce down to 3/4
Every return I have ever seen entering the tank has been 3/4 but it doesn't need to be 3/4 the whole way. I would run 1.0 then within a foot or two reduce down to 3/4