I have another question on my mission to get my pool all set up. the area that have my cutouts for the skimmer and returns are on the "high ground" side of my pool, as we had to dig into a slight slope to level. My question is, does the pool pump and filter system and heater have to be LOWER than the skimmer? Right now the ground where my equipment will sit, may put the pump a foot or so lower than the skimmer outlet...is this ok??