Turn pool dimensions into dependable filtration sizing. Compare media types, pipe velocity, and pump power. Download clean summaries for bidding and on-site decisions today.
| Scenario | Inputs | Key outputs |
|---|---|---|
| Residential pool | 25 m × 10 m, depth 1.5 m, turnover 6 hr, sand rate 15 | Flow ≈ 275.2 gpm, area ≈ 18.3 ft², sand D ≈ 57.7 in |
| Commercial pool | Volume 75,000 gal, turnover 4 hr, D.E. rate 2.0, safety 15% | Flow ≈ 359.4 gpm, area ≈ 179.7 ft², backwash depends on system |
| Round pool | Diameter 12 m, depth 1.4 m, turnover 8 hr, cartridge rate 0.40 | Flow ≈ 83.1 gpm, area ≈ 207.7 ft², cleaning by service |
Turnover time is the target period to circulate a pool’s full volume through the filtration system. The calculator uses Q = V/(T×60), then adds a safety margin. For example, a 42,000 gal pool at 6 hours needs about 116.7 gpm before margin. Shorter turnover increases flow, pipe demand, and pump power.
Different filters operate at different design loadings. Typical starting points are 12–20 gpm/ft² for sand or glass, 1.5–2.5 gpm/ft² for D.E., and 0.30–0.50 gpm/ft² for cartridges. Use the default presets for early sizing, then override rates with manufacturer data for final selection.
Required area is computed as A = Qdesign/Rate. Higher flow or conservative rates increase area and may require multiple vessels for redundancy. After you calculate area, choose the next larger standard model to accommodate fouling, aging media, and seasonal operating variability without exceeding the rated loading.
Backwash demand is estimated with Qbw = A×BackwashRate. For sand systems, a common starting range is 12–18 gpm/ft², but it varies by media and water temperature. Confirm that waste piping, drains, and makeup water can support the backwash cycle without destabilizing pool level.
The velocity check uses v = Q/A based on pipe internal area. Many designers target moderate velocities to limit noise and friction losses, especially on long runs. Pump power is screened using HP = (Q×TDH)/(3960×η); finalize selections with a pump curve, measured headloss, and required operating points.
Use the turnover required by local codes or project specifications. When unsure, start with 6 hours for general pools, then adjust for bather load, water features, and operating hours.
Safety margin helps cover peak bather load, filter fouling, and real-world flow reductions. A typical early-design range is 5–15%, but confirm limits with the filter manufacturer and the owner’s O&M plan.
It is an equivalent circular diameter computed from the required filter area. Use it to understand scale, then select actual commercial models by rated area, valve configuration, and allowable operating pressure.
Override rates when the project has manufacturer submittals, special water quality goals, or unusual temperatures. Manufacturer limits and local codes should take priority over generic design ranges.
Enter dimensions in meters or feet, or enter volume directly in m³ or gallons. The tool converts volume to gallons internally to compute gpm, then also reports m³/h and L/s.
Real pump sizing depends on system headloss, fittings, filter clean/dirty curves, elevation changes, and required operating points. Use this estimate to sanity-check, then finalize using pump curves and detailed hydraulics.
Yes. After calculating, use the CSV for quick spreadsheet checks and the PDF for sharing. Always attach manufacturer data and code references when submitting a final design package.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.