1. What is the GPH to PSI Conversion?

The GPH to PSI conversion calculates the pressure (in PSI) generated by a pump based on its flow rate (in gallons per hour), head height (in feet), and efficiency. This is particularly useful for pool pump systems to ensure proper water circulation and filtration.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( GPH \) — Flow rate in gallons per hour
• \( Head \) — Total head height in feet
• \( Efficiency \) — Pump efficiency as a decimal (typically 0.6-0.85)
• 3960 — Conversion factor (foot-pounds per minute to horsepower)

Explanation: The formula converts the hydraulic power (determined by flow rate and head) to pressure, accounting for the pump's efficiency.

3. Importance of PSI Calculation

Details: Proper PSI calculation helps in selecting the right pump for your pool, ensuring adequate water flow for filtration and circulation while maintaining energy efficiency.

4. Using the Calculator

Tips: Enter GPH (gallons per hour), head height in feet, and pump efficiency (typically 0.85 for most pool pumps). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical GPH for pool pumps?
A: Residential pool pumps typically range from 20,000 to 60,000 GPH, depending on pool size and desired turnover rate.

Q2: How do I measure head height?
A: Head height is the total vertical distance the pump must move water, including pipe friction losses (typically 1-2 psi per 100 feet of pipe).

Q3: What's a good efficiency rating for pool pumps?
A: Modern energy-efficient pumps typically have 0.8-0.85 efficiency, while older models might be 0.6-0.7.

Q4: What PSI should my pool filter run at?
A: Normal clean filter pressure is typically 10-20 PSI. A rise of 8-10 PSI above clean pressure indicates it's time to backwash.

Q5: How does this relate to pump horsepower?
A: Horsepower can be calculated from PSI and GPH, but this formula gives you the pressure output directly.