1. What is the Pool Filter Size Calculation?

The pool filter size calculation determines the appropriate filter surface area needed for efficient pool water filtration. Proper sizing ensures optimal water clarity and circulation while maintaining energy efficiency.

2. How Does the Calculator Work?

The calculator uses the filter size formula:

Where:

• \( Pool Volume \) — Total water volume in gallons
• \( Turnover Rate \) — Flow rate in gallons per minute per square foot (gpm/sq ft)
• \( Filter Size \) — Required filter surface area in square feet

Explanation: The formula calculates the minimum filter surface area needed to handle the pool's water volume at the specified turnover rate.

3. Importance of Proper Filter Sizing

Details: Correct filter sizing is essential for maintaining water quality, reducing chemical usage, extending equipment life, and ensuring energy-efficient operation. An undersized filter will struggle to keep water clean, while an oversized filter may be inefficient and costly.

4. Using the Calculator

Tips: Enter pool volume in gallons and turnover rate in gpm/sq ft. Typical turnover rates range from 15-20 gpm/sq ft for sand filters and 0.375-0.5 gpm/sq ft for cartridge filters. Always consult manufacturer specifications for exact requirements.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical turnover rate for residential pools?
A: For sand filters: 15-20 gpm/sq ft; for cartridge filters: 0.375-0.5 gpm/sq ft; for DE filters: 2-3 gpm/sq ft.

Q2: How do I calculate my pool volume?
A: For rectangular pools: Length × Width × Average Depth × 7.5; for circular pools: π × Radius² × Average Depth × 7.5.

Q3: What happens if I choose the wrong filter size?
A: Too small: poor filtration, frequent backwashing, higher chemical use. Too large: higher initial cost, potential flow issues, inefficient operation.

Q4: How often should pool water turnover occur?
A: Most pools require complete turnover every 6-8 hours, meaning the filter should process the entire pool volume 3-4 times daily.

Q5: Are Hayward filters different from other brands?
A: While the sizing principles are similar, always consult Hayward's specific technical data for optimal performance and warranty requirements.