Pool, Spa & Water Treatment Chemistry worked example
Make-up Water Rate with total make-up water added of 10,500 gal: a worked example
Push total make-up water added up to 10,500 gal and the picture changes. This example computes every intermediate figure at that operating point. Use it for water purchasing, salt dilution planning, or facility water-use reporting.
The inputs for this scenario
- Total make-up water added: 10,500 gal (raised for this scenario; the documented default is 4,200)
- Reporting period length: 30 days (unchanged)
- Meter calibration factor: 1 x (unchanged)
Working through the calculation
- Applying the documented formula (Make-up water rate = total make-up volume / operating days x factor) to the inputs above produces each figure below.
- At this operating point the engine returns 350 gal / day for ratio, the number this scenario is built around.
- At this operating point the engine returns 350 value for raw ratio.
- At this operating point the engine returns 1 x for meter factor.
- At this operating point the engine returns 30 value for operating days.
How this compares with the baseline
- Against the tool's baseline example, where total make-up water added sits at 4,200 gal and the headline result is 140 gal / day, this scenario comes in 150% above the baseline at 350 gal / day.
- It computes the average daily volume of fresh water added to a pool or spa over a reporting period, adjusted for meter bias. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.
Results at a glance
- Ratio: 350 gal / day (headline result)
- Raw ratio: 350 value
- Meter factor: 1 x
- Operating days: 30 value
Run it with your numbers
- Every input above is editable in the live Make-up Water Rate calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.