Well I'll have to figure it out once I get it up and running but of course I fill the sump a 150 gallon rubbermaid and the two bulkheads I put in it are leaking so I had to empty it and now I have to figure out how to stop the leaks I'm guessing silicone cause I tighten the nut as much as I could and it still leaks cause of the curviness of the tub