How much salt for a saltwater pool?

Usually 3,000–3,500 ppm — about 30 lb per 1,000 gal from zero.

How long to dissolve?

About 24 hours with the pump running.

How often do I add salt?

Only to replace losses from splash-out, backwashing and rain.

How much salt does a pool lose per year?

Only what leaves with water: splash-out, backwash and rain.

Does salt damage pool surfaces?

Not at 3,000–4,000 ppm, but protect metal and natural stone.

How do I lower salinity?

Drain and refill part of the water.

Pool salt calculator

Pool size, current and target salinity: you get the pounds or kilos of salt and the bags to add.

Salt needed

179.2 kg

Bags of salt8 bag
Salt needed179.2 kg
Pool volume44.8 m³

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How it's calculated (visible formula)

salt (kg) = volume (m³) × (target ppm − current ppm) ÷ 1000

Net geometric measurement, no waste.
Adjustable waste % for cuts and breakage.
Purchase rounded up to sellable units (boxes, bags, buckets, boards).

See methodology and formula versions

How to calculate it, step by step

Work out pool volume.
Test current salinity.
Check the chlorinator's recommended level.
Work out pounds from the ppm difference.
Broadcast salt around the edge with the pump running.

Worked example: 11,840 gal from 0 to 3,200 ppm

44.8 m³ × 3,200 ÷ 1000 ≈ 143 kg
≈ 316 lb ÷ 40 lb bags

→ 8 bags of 40 lb.

Common mistakes

Dumping all salt without circulating and testing.
Overshooting the chlorinator range.
Using salt with unsuitable additives.

Pro tips

Add salt in two stages and test before topping up.
Use pool-grade salt without iodine or anti-caking agents.
Turn the chlorinator off until salt dissolves.
Inspect and clean the cell each season.

From calculation to quote

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FAQs

How much salt for a saltwater pool?: Usually 3,000–3,500 ppm — about 30 lb per 1,000 gal from zero.
How long to dissolve?: About 24 hours with the pump running.
How often do I add salt?: Only to replace losses from splash-out, backwashing and rain.
How much salt does a pool lose per year?: Only what leaves with water: splash-out, backwash and rain.
Does salt damage pool surfaces?: Not at 3,000–4,000 ppm, but protect metal and natural stone.
How do I lower salinity?: Drain and refill part of the water.

Sources and standards

Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.