How is pressure head calculated according to the Certified Pool - Spa Operator Handbook?

Pressure head is a critical concept in pool and spa operations, as it represents the height of water column that can be supported by pressure, typically measured in feet. The calculation for pressure head utilizes the relationship between pressure in pounds per square inch (psi) and feet of water.

The correct method for calculating pressure head involves multiplying the psi value by 2.31. This is derived from the conversion factor that 1 psi corresponds to approximately 2.31 feet of water column. This conversion is essential in understanding how much pressure is exerted by the water in the system and how it translates to height in practical applications, such as determining the effective pump lift or ensuring the equipment operates within optimal parameters.

The correct calculation allows pool operators to accurately assess and manage the system’s hydraulic performance, which is vital for maintaining safe and effective water circulation and chemical distribution throughout the pool or spa.