Swimming Pool Filter Size Calculator
Here’s a comprehensive table outlining the key factors to consider when determining the appropriate swimming pool filter size, along with some general guidelines.
| Factor | Details |
|---|---|
| Pool Volume | Calculate the volume of your pool in gallons (length x width x average depth x 7.48). |
| Turnover Rate | The time it takes to filter all the water in the pool. Most guidelines recommend: |
| – Residential Pools: 8 hours (3 turnovers per day) | |
| – Commercial Pools: 6 hours (4 turnovers per day) | |
| Filter Flow Rate | The rate at which the filter can process water, measured in gallons per minute (GPM). |
| GPM Calculation | Divide pool volume by the turnover time (in minutes). |
| Filter Type | Different types have different flow rates: |
| – Sand Filters: 0.5 – 2 GPM per square foot | |
| – Cartridge Filters: 1 – 2 GPM per square foot | |
| – Diatomaceous Earth (DE) Filters: 2 – 3 GPM per square foot | |
| Recommended Filter Size | Based on flow rates: |
| – Sand Filter: 20-30 GPM for pools up to 20,000 gallons | |
| – Cartridge Filter: 60-100 sq. ft. for pools up to 20,000 gallons | |
| – DE Filter: 36-48 sq. ft. for pools up to 20,000 gallons | |
| Head Loss | Consider the resistance to flow due to plumbing, fittings, and other components; generally measured in feet. A higher head loss may require a larger filter. |
| Maintenance | Filters need regular maintenance, including cleaning and replacement, which impacts longevity and performance. |
| Budget | Costs vary significantly between filter types, affecting initial investment and long-term maintenance. |