So how do you guys that have your sumps in the basement keep the water in the pipes leading upstairs during the feedcycle? My issue..., three times a day my Apex shuts the return pump off. Then all the water in the return pipes flows back to the sump (no problem, my sump can hold the backflush). The problem is when the return pump turns back on all the, now air, in the pipes blows back into the tank causing a ferocious boiling/splashing that results in unnecessary wet lights and saltcreep. I don't think I want to do a checkvalve - too many horror stories.