I have this house waterworks about three years ago gekauft.Fast three years everything was running smoothly, but suddenly the pump always went on and then off again. I've screwed then. Rust has formed on the fitting at the bottom of the diaphragm, which has now spread all over the pump. Luckily we had used the pump only for our two washing machines and not for Trinkwasserversorung.TIP 31188 House waterworks HWW 3600 i