01
The purpose
What does this calculator estimate?
Chlorine feed rate to keep up with bather demand on a commercial pool, plus metering pump sizing.
Commercial Pools · G3
Commercial Pool Chemical Feed Rate Calculator
Chlorine feed rate to keep up with bather demand on a commercial pool, plus metering pump sizing.
Measure the inputsCommercial pools dose continuously through metering pumps, not by hand.
Read the full resultBather load drives demand — peak hours need the highest feed rate.
Check the boundaryOn-site salt generation cuts chemical handling and storage risk.
Useful forCommercial PoolsPlanningComparisonVerification
Live calculation
Feed rate inputs
✓ Checked May 2026
Enter volume, bather load, targets, and chlorinator.
Reference result
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Enter the required values to calculate.
Enter the known values. Let the engine handle the calculation.
✓ Formula checked↻ Live result○ No account needed
Planning estimate only. Confirm product labels, equipment specifications, qualified-professional advice and local requirements before acting.
The result, explained
Use the Commercial Pool Chemical Feed Rate Calculator result with context.
Chlorine feed rate to keep up with bather demand on a commercial pool, plus metering pump sizing.
02
The tool
What information does it use?
- Pool volume: Total gallons.
- Bathers per hour: Peak hourly bather load.
- Target free chlorine: Commercial often 2–4 ppm.
- Target pH: enter a measured or verified value
- Chlorinator: Liquid 12.5%, cal-hypo 65%, or on-site generation.
- Acid type: Muriatic 31% or CO2.
03
The method
How to use this calculator
- Pool volumeTotal gallons.
- Bathers per hourPeak hourly bather load.
- Target free chlorineCommercial often 2–4 ppm.
- Target pHEnter the value you can verify.
- ChlorinatorLiquid 12.5%, cal-hypo 65%, or on-site generation.
- Acid typeMuriatic 31% or CO2.
04
The relationship
The formula in plain English
Bather FC demand = (bathers/hr × 0.5) ÷ (volume ÷ 10,000)
Each bather ≈ 0.5 ppm FC demand per 10,000 gal per hour. Feed rate replaces that demand continuously.05
Worked through
A worked example: 100,000 gal pool, 50 bathers/hr
- FC demand = (50 × 0.5) ÷ (100,000 ÷ 10,000)
- = 25 ÷ 10 = 2.5 ppm/hr equivalent demand
- Feed rate must replace 2.5 ppm/hr across 100k gal
| Bathers/hr | 50,000 gal | 100,000 gal | 150,000 gal |
|---|---|---|---|
| 25 | 0.25 | 0.13 | 0.08 |
| 50 | 0.50 | 0.25 | 0.17 |
| 100 | 1.00 | 0.50 | 0.33 |
| 150 | 1.50 | 0.75 | 0.50 |
06
Why it matters
How the result supports the next decision
Commercial pools dose continuously through metering pumps, not by hand.
Bather load drives demand — peak hours need the highest feed rate.
07
Good inputs
Improve the estimate before relying on it
- Commercial pools dose continuously through metering pumps, not by hand.
- Bather load drives demand — peak hours need the highest feed rate.
- On-site salt generation cuts chemical handling and storage risk.
- CO2 for pH control is safer to store than muriatic acid in public facilities.
- Size metering pumps with headroom above peak demand for safety.
08
The boundary
How to interpret the result
The enforcing authority and the facility operating plan override this general reference.
The engine reports invalid inputs and safety warnings beside the result. Resolve those messages before using the estimate.
09
Before acting
What should override this estimate?
- Measured site conditions and current test results
- Product labels and manufacturer specifications
- Qualified-professional advice and applicable local codes
10
Common questions
Frequently asked questions
How do I calculate commercial chlorine feed rate?
Start from bather demand: each bather consumes roughly 0.5 ppm of free chlorine per 10,000 gallons per hour. Multiply by your peak hourly bather load and scale to your volume to get the ppm-per-hour the feeder must replace, then convert to a product feed rate in gallons or pounds per hour for your chlorinator type.
How much chlorine does a bather consume?
As a planning figure, about 0.5 ppm of free chlorine demand per 10,000 gallons of pool volume per bather per hour. Heavy, hot, or young-child bather loads push demand higher. This is why commercial feed rates are sized to peak bather load, not average — the system must keep chlorine in range at the busiest hour.
How do I size a chemical metering pump?
Determine the peak product feed rate in gallons or pounds per hour from bather demand, then choose a metering pump with capacity comfortably above that peak so it can recover after spikes. Sizing with headroom prevents the chlorine residual from sagging during the busiest periods, which is when sanitation matters most.
Should a commercial pool use CO2 or acid for pH?
Both control pH, but carbon dioxide injection is often preferred in public facilities because it's safer to store and handle than concentrated muriatic acid, and it self-limits — it can't drive pH dangerously low. Muriatic acid is effective and cheaper but carries greater storage and handling hazards.
Why do commercial pools feed chemicals continuously?
Because their large, fluctuating bather loads consume chlorine constantly and unevenly, manual dosing can't keep the residual stable. Automated metering pumps tied to controllers feed chlorine and pH chemicals continuously in response to demand, holding water quality within code at all times rather than in periodic corrections.
How much chlorine for a commercial pool?
Sized to bather demand — about 0.5 ppm FC per 10,000 gal per bather per hour at peak load.
What chlorinator do commercial pools use?
Liquid feeders, cal-hypo feeders, or on-site salt generation, run continuously via metering pumps.
Is CO2 better than acid for commercial pH?
CO2 is safer to store and self-limiting; muriatic acid is cheaper but more hazardous.
Primary sources
Use the result with current guidance.
These official references support safe planning context. Product labels, local requirements and qualified-professional advice take priority over a general calculator estimate.