I've been working on sanitizing the fresh tank. The only drain I could find is the one in the utility bay coming straight out of the fresh tank....looks like a 1/2 inch tube...takes almost 90 minutes to drain the tank when full. I have faucets turned on and cold and hot values open....but it is so slow
.....am I missing something? Is there another valve somewhere that should be opened? Takes less than 15 minutes to fill.