Thanks Bob, I havent gone that far yet, I did suspect hard water as the inside of the inlet is heavily corroded. I called the company they say the pump is non serviceable. I found on line a parts list and it dont show a repair kit......would like a part diagram but company said NA on line.

Company recommends that if the pump is not going to be used in a month it need RV anti-freeze run thru the pump.

Thanks

Gerry