WHATS CAUSING THIS ANY IDEAS
NOISEY COLD WATER FLOW TO UPSTAIRS TOILET,TAPS CAN CURE THIS BY SHUTTING OFF WATER AT STOPCOCK AND DRAINING COLD WATER FROM PIPES BUT THIS LASTS ABOUT 3 WEEKS THEN NOISE ON WATER FLOW RETURNS.
NOISEY COLD WATER FLOW TO UPSTAIRS TOILET,TAPS CAN CURE THIS BY SHUTTING OFF WATER AT STOPCOCK AND DRAINING COLD WATER FROM PIPES BUT THIS LASTS ABOUT 3 WEEKS THEN NOISE ON WATER FLOW RETURNS.