More questions regarding my plumbing project of yesterday. I replaced two valve stems in a shower/tub and had to clean out material that was clogging what I assume are the valve seats due to low flow. I did this by gently disturbing the material with a small screwdriver, then blowing it out without the stems in place.
Today I tried draining the hot water heater since the hot faucet is the one that was clogged yesterday. When I opened the drain to drain the tank very little water came out so I turned the water to the heater on to flush it out and let it run for several minutes. Then turned the tank's water control off and still no water drained from it. So I closed the drain pipe and turned the water back on to fill the heater. Tank had never been drained before this attempt.
Then when in the bathroom where I replaced the valve stems a couple of hours later, I could and still can hear what sounds like water running behind the wall. Water flow in the tub was reduced for both hot and cold this time, so I removed the stems and again there was this white sediment clogging both valves. I cleaned that out again.
The water supply valve for the house is OFF, but I am still hearing what sounds like water running behind the shower wall. No water leaking from the valves or any faucet in the house. The water shut off valve is just outside the affected shower wall. This bathroom is the furthest site of water consumption from the water heater.
Could I have damaged something by running water through the hot water heater for an extended time period? Or could what I'm hearing be air in the pipes? Unfortunately, this does not sound like air. I'm not getting how I could be hearing water running behind the wall with the main supply valve off.
Any ideas?
Thanks.