Hey guys thanks for the help. I just installed a 1HP Goulds Shallow Well jet pump in my pool pump house. I'm pumping from a pond with a foot valve in a pea rock filter. The pond is about 400 feet from the pump, run is 1.25" poly pipe. The pressure side is connected to 1" PVC run to a 19 gallon flotech pressure tank then out to the sprinkler system and some hose bibs. The pressure switch is a 30/50 which came installed on the pump. Tank has 28 psi. The system works great, good pressure, good volume. Problem is when the pressue hits the high cut off and turns off pressure goes down to 30 and the pump turns back on again the pressure switch just slaps, causing the pump to cycle very fast. If I increase the load(turn on more hoses) it will do it less, still slaps a few times but stops and runs normally after a few seconds. If I have just one hose on it will continue to slap till I turn off the breaker. Originally I had it installed without a check valve between the pump and pressure tank, I installed one hoping that would fix it but it made it worse. Any help/suggestions would be greatly appreciated. Emmett
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