Hi,
I have low flow in my upstairs cold water. Sink and bath starts as a poor flow and then pitters out. Toilet refills very slowly and shower will not work at all. Header tank is full. I had isolated cold water from header tank (as there was no neva valve) to replace the syphon in the toilet. After this job was successfully completed I turned the valve back on. Flow was brill for a few days but now has problems. I have tried adjusting the valve to make sure it is definitely open and it is. I am wondering could the copper pipe be blocked or is there likely to be another issue?
Appreciate all help and thank you.