Pool Salt Dose
Pool salt to add for a salt-chlorine generator, or the water to replace to lower an over-salted pool.
Example
You enter
- Pool volume (gal) 20000
- Current salt (ppm) 2000
- Target salt (ppm) 3200
You get
- Change +1,200 ppm
- Salt (lb) 200.16
- Salt bags 6
Checked against published worked examples from: Hayward.
Details, formula, and sources
ScopePool 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 or tableAdd: salt lb = gallons x 8.34 lb/gal x ppm rise / 1,000,000, bags = ceil(lb / 40); lower: drained fraction = 1 - target/current.
Source and editionMass-balance identity (NSPF CPO / ANSI-APSP-ICC, by name); 8.34 lb/gal water.
Free accessCell spec plate and salt-bag label free with the equipment.
What governsMath aid for personal verification. Stop work and consult the qualified person on site if any number does not match the field condition.
API field namesgallons, current_salt_ppm, target_salt_ppm, delta_ppm, salt_lb, salt_bags
- Target salt band ~3,000-3,500 ppm on the cell spec plate (advisory)salt-cell maker