incase you dont understand how i have it set up basically i drilled a hole in my sump a little higher than the normal water level so when the water raises to that level it drains and put a shut off valve on it which stays closed all the time except when im doing my water change.... i drilled a hole in the wall the tank is on going outside to the side of my house where i keep the brute container, ATO container, r/o unit ect... i have 1 line coming in and one line going out so as i pump the new water in the old water drains out... ill take some pics of the setup when i get a chance