I have a wanner D10 diaphragm pump...iut of nowhere it started pulsating the solution line... The past you could just bleed this out of the system I have tried everything I have no air bubbles coming through my G pH meter which would indicate there is no air leakage or cracked fittings I have disconnected my outgoing line before the Quick Connect and the hot water c** shooting out pulsating I have dialed down my bypass and worked it back up slowly... I am out of ideas only to hope that I haven't busted a spring or a valve in my pump this pump is in a steam genie system PTO Drive