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I have installed a modern mixer tap unit which has a cold and hot water feed. I have place isolating valves on both the cold and the hot water feeds. The hot water is fine but when I turn the cold water feed on the noise is unbearable and can be heard in every room of the house. My thought is...

I have fitted a pump as part of a shower installation but I have reduced pressure when the pump cuts in and sometimes the pump stops working for a short period then starts up automatical. I think I have a problem with hot water supply to the pump from the tank.Can anyone help.