Pool Salt Dose
Pool salt to add for a salt-chlorine generator, or the water to replace to lower an over-salted pool, by a straight mass balance. Reported in pounds and 40-lb bags.
Formula and source
Add: salt lb = gallons x 8.34 lb/gal x ppm rise / 1,000,000, bags = ceil(lb / 40); lower: drained fraction = 1 - target/current.
Mass-balance identity (NSPF CPO / ANSI-APSP-ICC, by name); 8.34 lb/gal water.
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