Short cycling of the potable water pump is avoided by the proper use of a __________.
hydro-pneumatic tank completely filled with compressed air at system operating pressure
hydro-pneumatic tank filled with water
charge of air, at 20 psi (137.9 kPa) above system pressure with the hydro-pneumatic tank one quarter full of water
charge of air, at system pressure, when the hydro-pneumatic tank is half full of water
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