I'm in a very flood prone area and need to elevate my pump, heater & filter about 32" above current position. I'm new to pools and seek your advice. The attached photo shows where I need to cut the inlet/outlet pipes to add extensions for the new higher pad I will build. The current pad is about 3 ft BELOW the pool water level..... The INLET shouldn't be a problem as the cut is after the valve, however I'm concerned the cut below the OUTLET valve MAY create a massive backflow of water from the pool ??