Suspicion would be algae or trash in the line, stops the check valves from sealing which stops the pump action. A pump/fan/blower is much more sensitive to any restriction on intake in linear results vs output restrictions, but check valves not working stops all. BEST is large screens on intake and filter on output side? Disassembly/ cleaning of all may reveal the cause, to include shower head holes?
Pump also needs to be as low as possible, as suction is NOT that type pumps strong point. Good Luck
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10
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