New pool build this year includes a closing. I installed the solid safety cover myself. It has a center drain. My builder came, dismantled my pump and filter, clean the inside of filter, blew out all lines, installed plugs on returns, and gizzmos on both skimmers. Water is over returns and about 3 inches into skimmer. Isn't the water supposed to be below the skimmer???? I'm in NY, so there will be freezing. Am I missing something?