A saltwater pool is a chlorine pool: a salt cell turns dissolved salt into chlorine, so you buy salt instead of chlorine tablets. Choose a cell rated for more gallons than your pool holds, often 1.5 to 2 times, keep salt in the maker's range (often about 3,000 to 3,500 ppm), and expect to replace the cell every few years. Salt pools tend to drift up in pH, so test and adjust regularly.
Salt systems make pool ownership smoother, but they are not chemical-free. Here is how they work and what to expect.
How it works
Salt (sodium chloride) is dissolved in the pool. As water passes through the cell, electrolysis turns chloride into chlorine, which sanitizes the water and eventually reverts to salt. You still test and balance; you just stop buying chlorine.
Sizing the cell
| Pool | Choose a cell rated for |
|---|---|
| 15,000 gal | About 25,000 to 30,000 gal |
| 20,000 gal | About 30,000 to 40,000 gal |
| 30,000 gal | About 40,000 gal or more |
Oversizing lets the cell run at a lower output percentage, which extends its life. Hot climates and heavy use need more capacity. Find your volume in our pool gallons guide.
Keeping it working
| Task | Why |
|---|---|
| Keep salt in range | Low salt reduces output; high salt can trip errors |
| Inspect and clean the cell | Scale buildup lowers output |
| Maintain stabilizer (CYA) | Protects chlorine from sunlight |
| Watch pH | Salt pools tend to drift upward |
| Check flow | Cells need minimum flow to run |
Costs
You trade chlorine purchases for the cell’s price, a slightly longer daily run time and salt top-ups. The cell is a consumable; budget for a replacement every few years.
Compatibility
Check that heaters, pump seals, ladders, coping stone and automatic covers are approved for salt water.
Test regularly with a reliable kit; see pool test kits. Browse water chemistry.
Common questions
Do saltwater pools have chlorine?
Yes. The salt cell makes chlorine from salt. The water is much less salty than seawater.
What salt level should a saltwater pool have?
Follow your cell's manual; many systems target about 3,000 to 3,500 ppm.
How long does a salt cell last?
Often 3 to 7 years depending on hours, water chemistry and how it is maintained.
Do salt pools damage equipment?
Salt can corrode some metals and natural stone. Check that your heater, ladders and coping are salt compatible.