So I installed a mesh safety cover this fall. I am in Northern NJ and we do get some pretty cold winters. I lowered my water level to just below the 2 returns. Since I have closed we have had about 4 inches of rain. I just popped corner of cover off and the water is above the returns. So my question is...do I need to keep the water level down below the returns all winter? I have read of the ice ripping the returns right out of the wall. The pool is fiberglass so I am hesitant to drain anymore water than absolutely necessary. Any insight is appreciated. Thanks!