From outside the pipes, if it is dry, try diotomaceous earth. I bought it at the local hardware store. It it fossilized shells from small creatures (diatoms) it cuts their bodies and absorbs their...
Common culprits: Air in the pipe. Poorly engineered valve. Loose hanger brackets. The quickest and easiest fix is to put a piece of felt (furniture foot pads work) between the pipe and its hanger.
air gets in the pipes.
The main way air goes into the water pipes is because of vacuum and there is many was to have a vacuum on a open non pressure line, because air is lighter then water it will...
Yes, as long as the water coming out of the pipe has a greater pressure than the water that is covering the pipe. If it is the other way around, the water covering the pipe will actually flow into...