1. What is a Pool Pump GPM Calculator?

Definition: This calculator estimates the flow rate (in gallons per minute) of a pool pump based on its horsepower, efficiency, and total head.

Purpose: It helps pool owners and maintenance professionals determine the appropriate pump size and expected flow rate for proper pool circulation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( HP \) — Pump horsepower
• \( \eta \) — Pump efficiency (typically 0.7-0.85)
• \( H \) — Total head (feet of water column)

Explanation: The formula calculates how much water the pump can move based on its power, efficiency, and the resistance (head) it must overcome.

3. Importance of Flow Rate Calculation

Details: Proper flow rate ensures adequate filtration, chemical distribution, and prevents issues like algae growth or equipment damage.

4. Using the Calculator

Tips: Enter the pump horsepower, efficiency (default 0.8), and total head in feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is total head in pool systems?
A: Total head is the resistance the pump must overcome, including pipe friction, elevation changes, and filter pressure.

Q2: What's a typical pump efficiency?
A: Most pool pumps have efficiencies between 70-85% (0.7-0.85). Energy-efficient models may be higher.

Q3: How often should pool water circulate?
A: Ideally, the entire pool volume should circulate every 6-8 hours (2-4 times daily).

Q4: What's the relationship between GPM and turnover rate?
A: Turnover rate = Pool volume (gallons) / Flow rate (GPM) / 60. This gives hours to circulate entire pool.

Q5: How do I find my pool's total head?
A: Consult system specifications or measure pressure at the filter and convert to feet of head (1 psi ≈ 2.31 ft).