· by Michael Blair, Nashville's Pool & Spa
The common misunderstanding is that saltwater pools do not use chlorine. They do — a cell electrolyses salt in the water to produce it continuously rather than you adding it.
What differs day to day
Chlorine is produced steadily rather than dosed, so levels are more stable and there is less handling of chemicals. Many people find the water feels softer and is gentler on eyes and swimwear.
You still test and balance pH, alkalinity and stabilizer exactly as with a traditional pool.
What it costs
The generator is a real up-front cost, and the cell is a consumable that typically lasts a few years before replacement. Salt itself is inexpensive.
Running costs are generally lower than buying chlorine, and the cell replacement offsets a portion of that.
- Saltwater pools still use chlorine, generated on site
- Cell is a consumable, replaced every few years
- pH tends to drift upward and needs watching
- Salt is corrosive to some metals and stone
- Still need to test and balance everything else
The corrosion question
Salt at pool concentration is corrosive to some metals, and it affects certain natural stone coping and untreated fixtures over time.
It is manageable with the right materials, and it matters most when converting an existing pool that was not built for it.
pH drift
Generating chlorine from salt raises pH, so saltwater pools need acid more regularly than traditional ones. It is a routine adjustment rather than a problem.
People who expected a hands-off pool are usually surprised by this rather than by anything else.