My gunite 17000 gal. salt gen. pool was leaking water all the way down so I knew it was MD. I dove to place plugs in both MD the leak stopped, now I am totally lost on how to set the valves as I need pool school to configure the spa and skimmer and MD until I can pay upwards of $5000.00 for repair most likely. My first question is if I have accidently turned the wrong valve and the MD is "on" what are the ramifications, consequently I just turned the whole filter down. I just got the pool so pretty and I need advice to run strictly off skimmer. My heater and polaris are no longer in use I believe no problem as they are at far end of pump lines and the valves are all on off. I think I may need to take pictures of the line structure so you'll see which goes where for me, I cant tell you how much I am appreciative I would be.