To drain your plumbing system and recharge air chambers to stop water hammer, follow these steps. First, turn off your main indoor water supply valve. Next, open all the highest faucets in your home (such as upstairs showers and sinks), then open all the lowest faucets and outdoor hose bibs to let gravity drain every drop of water from the pipes. Once completely empty, close all faucets and slowly reopen your main water valve to trap fresh air pockets inside upper pipe runs. Verification: Open and close household faucets rapidly to confirm whether air chambers have successfully recharged.
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