Pool & spa
Pool Salt Calculator
Salt to add for a saltwater chlorinator, in pounds and 40 lb bags.
Result
Dose against a test result, never against a schedule. Add chemicals in stages with the pump running, wait for a full turnover, then retest before adding more. Never mix chemicals, and never add water to acid. Where a product label differs from the figure here, the label wins. Salt is not consumed, only diluted by rain and splash-out or lost through backwashing, so it needs topping up rarely. Running a cell below its minimum salinity damages it, and running above the maximum is corrosive; both limits come from the cell manufacturer rather than a general figure.
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About this calculator
What salinity should a salt pool hold?
Usually 2,700 to 3,400 ppm, but follow the cell manufacturer. Too low and the cell works hard and wears out; too high and it corrodes fittings and stonework.
Does a salt pool still use chlorine?
Yes. The cell makes chlorine from the salt, continuously and on site. It is a chlorine pool with its own generator, not a chlorine-free one.
How do I lower salinity?
Dilution only. Drain some water and refill, which is why it is worth adding salt in stages and retesting.
The formula
about 8.35 lb of salt per 10,000 gallons raises salinity 100 ppm
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