SpecialtyInstant Tool
Pool Salt Calculator
Calculate how many 40 lb bags of pool salt are needed to hit ideal salinity PPM based on pool gallons.
gal
PPM
PPM
$
How Pool Salt Calculator Works
Pounds of Salt = Target PPM minus Current PPM ÷ 100 × Gallons ÷ 10000 × 8.35A standard saltwater chlorine generator operates optimally at 3200 PPM parts per million. Every 10000 gallons of pool water requires approximately 8.35 pounds of pure pool salt to raise salinity by 100 PPM. Dividing total required pounds by 40 calculates the number of standard bags.
Variable Breakdown
Target
Target SalinityDesired salinity in PPM, typically 3200 PPM
Current
Current SalinityExisting salinity test reading in PPM
Gallons
Pool VolumeTotal pool water capacity in gallons
8.35
Salt ConstantPounds of salt per 10000 gallons per 100 PPM
Example Calculation
20,000 Gallon Pool Salinity Adjustment
A pool measuring 20000 gallons with a current reading of 1000 PPM targeting 3200 PPM.
- Determine PPM needed: 3200 - 1000 = 2200 PPM increase.
- Apply pool formula: 2200 ÷ 100 × 20000 ÷ 10000 × 8.35 = 367.4 lbs.
- Divide by bag weight: 367.4 lbs ÷ 40 lbs per bag = 9.18 bags.
- Round up to next whole bag: 10 bags.
Result:10 Bags of 40 lb Pure Pool Salt - 367 lbs
Salt Bags Needed for Fresh Startup at 3200 PPM
| Pool Volume Gallons | Pounds of Salt Needed | 40 lb Bags Needed | 50 lb Bags Needed |
|---|---|---|---|
| 10000 gal | 267 lbs | 7 bags | 6 bags |
| 15000 gal | 401 lbs | 10 bags | 8 bags |
| 20000 gal | 534 lbs | 14 bags | 11 bags |
| 25000 gal | 668 lbs | 17 bags | 14 bags |
| 30000 gal | 802 lbs | 20 bags | 16 bags |
Frequently Asked Questions
What is the ideal salt level for a saltwater pool?
Most saltwater chlorine generators Pentair, Hayward, AutoPilot require an ideal salinity range between 3000 and 3500 PPM, with 3200 PPM being the optimal target.
How much salt does a 10000 gallon pool need from scratch?
A fresh 10000-gallon pool requires approximately 267 pounds of salt about 6.5 to 7 bags of 40-lb pool salt to reach 3200 PPM.
How do you properly add salt to a pool?
Broadcast salt around the perimeter of the deep end, brush with a pool brush to dissolve completely, and leave the pool pump running for 24 hours before turning on the salt chlorinator cell.
Does pool salt evaporate?
No, salt does not evaporate with water. You only lose salt through splash-out, backwashing, leaks, or heavy rainfall overflow dilution.
What type of salt should be used in a saltwater pool?
Use only high-purity food grade evaporated pool salt with at least 99.4% purity. Avoid iodized table salt or rock salt containing yellow prussiate of soda.
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