Glossary: Water Pressure Key Terms

Bladder Tanks
Commonly referred to as diaphragm or captive tanks, bladder tanks are steel tanks that have a "bladder" which holds the tank's air supply separate from the water. This feature allows the tank's air pressure to be preset at the factory, eliminating the need for ongoing pressurization maintenance. The factory set pressure also allows water to be drawn from the tank without the pump having to run every time a faucet is turned on. Bladder tanks vary in size up to over one hundred gallons.

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