I shut off the main water supply in the evening to replace the shower cartridge. I came back the next afternoon to finish the job. When I turned on the water main I started getting continuous water hammer. I shut things back down again.
I went and opened 2 of 3 sinks, the tub, and the outside hose all the way, but I still get this symptom.
I have valves to control the supply side (before the water meter) and after. The supply side is fully open, and I've been opening and closing the side after the meter.
What should I be doing so I don't ruin my plumbing just trying to fix a dripping tub spout?
Best Answer
It is natural to have some water hammering when you had your water turned off for a day and turn it back on.
You probably had a sink on or something so that when you turned off the water the excess pressure pushed it out somewhere - not your shower. So your waterlines are filled up with air. The air has to go out places and will create huge air pockets that will make noise when moved. Turn on your water supply and turn on everything for a few minutes and it should quickly go away.