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Well or city water?
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City.
Too much pressure causes the "Banging"?
I thought it had something to do with air in the lines...
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Are you trying to increase the pressure to cure the "banging" in the pipe? IF so, that "banging" is called water hammer. The water hammer is caused when the water flow is suddenly stopped ie momenteum. There are columns of pipes with trapped air inside that is suppose to prevent that. When the air columns get water inside it causes water hammer.
If you want get rid of the water hammer try this:
1)close off the water at the main inlet, usually in the front of the house.
2) open a faucet inside your house
3) go to the lowest part of your house and open the spigot, like a garden hose etc. and drain the water until it stops.
4)go inside your house close off the faucet.
5) turn on the main inlet water
6) go turn on SLOWLY the water faucet inside the howse to let the air out and your're done.