Well I got it filled with water (fresh) just to test things out & check for leaks(no leaks,woo hoo!) Now the quandy I have is when I shut the pump off, the water is draining back through the return loc line fittings & therefore I either have to keep the returns pointed up or keep the water level in the sump lower than I'd like. Is there a check valve or something like that you can put in the return line to prevent this? Also my overflow line does have a suction break I think they are called(a little air line coming out of the top of the return,it's a gl*******s 700gpm overflow)