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This problem lies with your pipe sizes. If the pipes size of your main line does not equal the supply for demand this will result in the current problem. For example, if your whole house is fed with half inch piping and you open two taps the volume of water has to be shared from the half inch pipe, thus causing a drop in pressure. Whereas if one installed three quarter inch main line "t-ing" off to half inch, because the three quarter inch will hold a higher volume of water when two taps are opened and the water shared, the drop in pressure will be hardly noticeable.

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Q: What causes your water pressure to drop significantly when more than one faucet is used?
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Related questions

What causes high water pressure in the first faucet on the water line from where it enters the house. The cold water is under high pressure but other faucets in house are fine.?

Possibly a pressure reducing valve installed after piping for first faucet, which would cause situation describing.


We just had a new bathtub faucet installed and it leaks. The plumber claims it is due to low water pressure. Is that true?

No, too high of water pressure causes problems.


What would cause low water pressure in a bathtub faucet?

The faucet is clogged


What is the meaning of all of a sudden low water pressure coming out of faucet?

well if you have a plugged aerator or your water line is corroded then that is usually the reason a faucet has low pressure if its just one faucet.


Can too high water pressure turn the faucet on?

no


Can a faucet turn itself on because of pressure in the pipelines?

No. It takes much more than water pressure to turn on the water faucet. At most, there is a leak if anything at all.


How does water travel up into a faucet?

It is pushed by the water pressure in the system.


Does a roman tub faucet have good water pressure?

A Roman tub faucet does have good water pressure because it is made to do that. How good this is depends on how other brands perform in this area.


What causes your kitchen sink to shake when the faucet is on?

The water pump.


What causes sudden pressure surges in your faucets and refrigerator door water dispenser?

I would purchase a Watt water pressure guage from your local home improvement or hardware store and check your water pressure at your faucet. If water pressure is greater than 40-45psi your regulator needs to be turned down where the water comes into the house.


What causes a decrease in water pressure in just the the upstairs bathroom sink?

Unscrew the aerator from the end of the faucet where the water comes out and clean the screen. Sediment build up slows the flow.


What causes low water pressure in just one set of faucets when all other faucets on the house have good pressure?

You have to undo the aerator at the end of the faucet and clean the screen or plastic water saver out. It will be plugged with sand or sediment.