Is it a reasonable idea to put a small submersible pump to circulate water from bottom of pool to top. The pool is not opened yet and the solar cover is on. I noticed that the surface temp during sunny day to be 50 degree but only 40 degree 4 foot down. Would the pump increase the solar heating from the solar cover.Or is this a waste of time money and electricity. I may also use the pump to run water through 2oo ft of garden hose.