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I have a basement sump pump. PVC pipe comes up from the pump 4 feet then 90 degree turn thru wall to outside (4 feet). Then 90 degree turn down 2 feet into 4" pvc that runs the length of the back of the house - above grade and simply empties out on the side of the house - 15 feet from the house. Do I need a backflow preventer on this and why?