Salt Chlorine Generators

Quick Answer

A salt chlorine generator (SWG) converts dissolved salt in your pool water into chlorine automatically — no more buying, storing, or handling chlorine. You still have a chlorine pool (salt water IS chlorine water), but the chlorine is produced continuously and gently. SWGs cost $800–$2,000+ installed and the salt cell needs replacement every 3–7 years ($400–$900). For many pool owners, the convenience and water quality improvement make it worthwhile.

What You Need to Know

• Salt pools ARE chlorine pools — the generator converts salt (NaCl) into chlorine (HOCl) through electrolysis. The chlorine sanitizes the water just like liquid chlorine or tablets would.
• The water feels softer — at 3,200 ppm salt, the water is about 1/10 the salinity of ocean water. Most people find it noticeably smoother on skin and less irritating to eyes.
• You still need to manage water chemistry — pH, alkalinity, CYA, and calcium hardness all still matter. In fact, salt pools have specific chemistry tendencies you need to understand.
• The salt cell is the consumable part — it has a finite lifespan (typically 10,000–20,000 hours or 3–7 years) and costs $400–$900 to replace.
• Salt doesn’t evaporate — once you add salt, it stays in the water. You only need to top up salt when water is lost (splash-out, rain overflow, or water replacement).

How Salt Chlorine Generators Work

The process is called electrolysis:

1. You add pool-grade salt to your pool water (typically 3,200–3,400 ppm)
2. Pool water flows through the salt cell — a chamber with electrically charged metal plates (usually titanium coated with ruthenium or iridium)
3. An electrical current passes through the plates, splitting the dissolved salt (NaCl) and water (H₂O) molecules
4. This produces hypochlorous acid (HOCl) — the same active sanitizer produced by liquid chlorine, tablets, or any other chlorine source
5. The chlorine sanitizes the water, killing bacteria and algae
6. After the chlorine is “used up,” it recombines back into salt — and the cycle repeats

This is why you rarely need to add more salt — it’s continuously recycled. The only chlorine “loss” is from UV degradation (which is why CYA is still needed) and oxidation of contaminants.

Salt Chlorine Generator Components

Sizing a Salt Chlorine Generator

SWGs are rated by the maximum pool size (in gallons) they can chlorinate. Always oversize by 1.5–2x your actual pool size. This lets you run the cell at a lower output percentage, which dramatically extends cell life.

Salt Levels and How to Add Salt

Target Salt Level

Most SWGs require 3,200–3,400 ppm salt. Check your specific model’s manual — ranges vary slightly:

How Much Salt to Add

How to Add Salt

1. Test current salt level (test strips, salt meter, or the SWG’s built-in sensor)
2. Calculate how much to add based on the table above
3. Use pool-grade salt only — pure NaCl without anti-caking agents, iodine, or yellow prussiate of soda. Bags labeled “pool salt” at any pool store work perfectly. Solar salt (water softener salt) works too as long as it’s 99.4%+ pure NaCl.
4. Pour the salt directly into the pool — walk around the perimeter, broadcasting it across the deep end and shallow end
5. Run the pump for 24 hours to dissolve and circulate. Do NOT turn on the SWG until salt is fully dissolved.
6. Re-test after 24 hours and adjust if needed

Salt Pool Water Chemistry

Salt pools have specific chemistry tendencies that differ from traditional chlorine pools. Understanding these is critical:

Key Differences from Traditional Chlorine Pools

For a comprehensive deep dive into managing salt pool chemistry, see our Saltwater Pool Chemistry guide.

Salt Cell Maintenance

Inspecting the Cell

Check the cell every 3–6 months (monthly in summer) for calcium scale buildup on the plates. Scale reduces chlorine production efficiency.

How to Clean a Salt Cell

1. Turn off the pump and SWG
2. Remove the cell from the plumbing (unscrew the unions on either end)
3. Inspect the plates — white, flaky buildup on the metal fins is calcium scale
4. If light scale: Spray with a garden hose to flush loose deposits
5. If heavy scale: Prepare a 4:1 water-to-muriatic-acid solution in a clean plastic bucket or the cell cleaning stand (sold separately)
6. Submerge the cell in the acid solution for 5–15 minutes — you’ll see bubbling as the acid dissolves the scale
7. Remove and rinse thoroughly with a garden hose
8. Reinstall the cell and restart

Cell Replacement Indicators

Your cell needs replacement when:

• The control box shows a “Check Cell” or “Replace Cell” warning
• Chlorine production drops even at high output % settings
• The cell is visibly corroded or the plates are worn thin
• Cleaning no longer removes scale (plates are too degraded)
• The cell is 5+ years old and struggling to maintain chlorine levels

Top Salt Chlorine Generator Brands

Converting an Existing Pool to Salt

Converting from a traditional chlorine pool to salt is straightforward:

1. Purchase and install the SWG — the cell plumbs inline (after the filter, before the heater). The control box mounts on the wall.
2. Check equipment compatibility — salt water is slightly more corrosive than fresh water. Modern pool equipment handles it fine, but check for:
   • Metal pool ladders, rails, or light rings — stainless steel 316L is salt-compatible; lower grades may corrode
   • Stone coping — some natural stone is salt-sensitive (limestone especially)
   • Heater — copper heat exchangers can corrode faster with salt; cupro-nickel exchangers are better
3. Add salt per the sizing table above — for a 15,000-gallon pool starting from 0 ppm, you’ll need about 400–500 lbs of salt (~10 bags of 40-lb pool salt)
4. Adjust your chemistry targets — especially lower your TA target to 60–80 ppm and raise CYA to 60–80 ppm
5. Stop adding chlorine tabs — the SWG will handle chlorine production. Keep liquid chlorine on hand for shocking only.

Troubleshooting Salt Chlorine Generators

Frequently Asked Questions

Will salt damage my pool?

At 3,200 ppm, the salt concentration is very low (ocean water is ~35,000 ppm). Modern pool surfaces — plaster, pebble, fiberglass, vinyl — handle salt just fine. The main concern is natural stone coping/decking (especially limestone or porous stone) and lower-grade stainless steel fixtures. Check compatibility before converting.

Can I taste the salt?

Barely. At 3,200 ppm, most people don’t taste salt in the water. The human taste threshold for salt is around 3,500–4,000 ppm. You might notice a very slight softness to the water, which most people prefer over traditional chlorine pools.

Do I still need to add chlorine manually?

Occasionally, yes. The SWG handles daily chlorine production, but it can’t produce enough for shocking (super-chlorination). When you need to shock — after heavy rain, algae issues, or high bather loads — add liquid chlorine manually. Never rely on “boost” or “super chlorinate” mode alone for a serious shock.

Can I use a salt system with a heater?

Yes. The salt cell should be plumbed after the filter and before the heater so that freshly generated chlorine doesn’t pass through the heater at high concentration. Some heaters have cupro-nickel heat exchangers specifically designed for salt pools — these last longer.

How do I winterize a salt pool?

Turn off the SWG when water temperature drops below 60°F — electrolysis is inefficient and can damage the cell in cold water. Remove and store the cell indoors if freezing temperatures are expected. Maintain minimum chlorine levels with liquid chlorine through the off-season.

Related Pages

• Saltwater Pool Chemistry — Complete guide to managing water chemistry in a salt pool
• Chlorine Guide — How chlorine works, including in salt pools
• Salt Water vs. Chlorine Pools — High-level comparison for new pool owners
• Pool Heaters — How heaters interact with salt systems
• Salt Water Conversion Cost — Full financial breakdown of converting to salt