I have an old house, the water pressure goes up and down how can i fix
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Gu127760126
water pressure goes down while you are taking a shower if someone turns on another faucet
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Yes, Your pipes are under sized and need to be updated. Talk with a licensed plumber.
I don't think anything can be done because it is the water pressure to your home that is the problem.
Liz is correct and this is a common problem, used as a source of humor in situation comedies. The only way to fix it is new pipes.