My bilge pump (Hunter 336) cycles off and on after the first time it comes on because of then reverse water flow in the hose.My concern is that this is not good for the pump,switch and the battery. People have been advising me against putting in a check valve to stop this cycling but no one has given me a good reason why not to put in a check valve other then it is not a good idea. Can anyone tell me why ? If it is such a bad idea how do I stop the bilge pump from cycling on and off? Some times the pump will come on twenty times or more! It is driving me crazy ! The Hunter 336 has a small bilge and it is split in half, the cooler and shower both drain into the bilge on this boat. Thanks for your help!