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Filter Size Formula:
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Above ground pool filter size refers to the surface area of the filter media required to properly circulate and clean the pool water. Proper filter sizing ensures efficient water turnover and maintains water clarity.
The calculator uses the filter size formula:
Where:
Explanation: The formula calculates the necessary filter surface area based on pool volume and desired turnover rate to ensure proper water filtration.
Details: Correct filter sizing is essential for maintaining water quality, reducing chemical usage, and ensuring efficient pump operation. Undersized filters lead to poor water circulation, while oversized filters may be inefficient.
Tips: Enter pool volume in gallons and turnover rate in gallons per minute per square foot. Typical turnover rates range from 15-25 gpm/sq ft for sand filters and 2-4 gpm/sq ft for cartridge filters.
Q1: What is a good turnover rate for above ground pools?
A: For sand filters, 15-25 gpm/sq ft is typical. For cartridge filters, 2-4 gpm/sq ft is common. Always consult manufacturer specifications.
Q2: How do I calculate my pool volume?
A: For round pools: π × radius² × average depth × 7.48. For oval pools: length × width × average depth × 5.9.
Q3: What happens if my filter is too small?
A: Poor water circulation, increased chemical usage, cloudy water, and reduced filter lifespan due to overworking.
Q4: Can I use a larger filter than calculated?
A: Yes, larger filters provide better filtration and longer intervals between cleanings, but ensure your pump can handle the increased flow.
Q5: How often should I run my pool filter?
A: Typically 8-12 hours daily during swimming season to achieve complete water turnover at least once per day.