I just figured out from this board, that the second (plugged up) hole in the bottom of my skimmer, that I had been wondering about for 2 years now, is what most likely leads to my (also plugged up) main drain. Once my pool is swimmable (it's way too cold now), should I take a risk and unplug these valves? These valves have been plugged since I bought my house 2 years ago, so I am kind of suspecting they were plugged due to a leaky main drain, but I really have no way of knowing...my third (deep end) return is also plugged up...that one didn't work when I tried unplugging it last year..so whatever...but main drain would really help with circulation? Would anyone have plugged the main drain for any other reason other than a leak?
pool pros, what do you think...should I try to uplug the main drain and the second hole in my skimmer???? Or just leave well enough alone.