How to Convert a Chlorine Pool to Saltwater
A saltwater pool is still a chlorine pool — a salt chlorine generator (SWG) converts salt into chlorine automatically, so you stop hauling bleach every week. Here's the complete conversion, step by step.
What it costs
- Generator unit: $800–$2,000 (Hayward AquaRite and Pentair IntelliChlor are the most common), installed
- Salt for startup: $60–$150 depending on pool size (use our salt calculator for your exact number)
- Cell replacement: every 3–7 years, $300–$800 — budget for it
The 6 steps
- 1. Test and balance first. pH, total alkalinity and calcium hardness should be in range before you add a single grain of salt.
- 2. Check your equipment compatibility. Most pumps, filters and heaters are SWG-safe. Older soft copper or brass heat exchangers are the exception — verify before buying.
- 3. Install the generator. The cell is plumbed into the return line after the filter (and heater), and the control box mounts on the wall nearby. If you're comfortable wiring a timer, this is a DIY-able afternoon; otherwise a plumber charges $200–$400.
- 4. Add salt. Calculate the exact amount with our pool salt calculator — most pools going from 0 to 3,200 ppm need 250–450 lbs. Broadcast it around the perimeter with the pump running.
- 5. Wait 24 hours, then test. Salt reads low while dissolving. Only trust the reading after a full day of circulation.
- 6. Add stabilizer (CYA). Set 60–80 ppm with our CYA calculator — without it, the sun destroys chlorine faster than your cell can make it, and you'll blame the cell.
The first 30 days
- Week 1: Test FC, pH and salt every 2 days. Expect to fine-tune the generator's output percentage.
- Week 2–3: Set a routine — test FC and pH twice a week, salt once a week. Your cell's manual lists the target FC (usually 2–4 ppm).
- Month-end: Inspect the cell for scale, and test CYA. Write down your generator's output setting for next season.
Common conversion mistakes
- Trusting the salt reading too early — always wait the full dissolve time.
- Skipping CYA entirely — the #1 cause of "my cell can't keep up".
- Using rock salt or water-softener salt with additives — pool-grade sodium chloride only.
- Never testing again after install — salt pools still need weekly testing; they're lower maintenance, not zero maintenance.
Frequently asked questions
Is a saltwater pool actually chlorine-free?
No — the generator converts salt into chlorine. The difference is it makes chlorine continuously and automatically, at a steadier level than weekly bleach dosing. That's why the water feels softer and smells less "chlorinated".
Can I convert an above-ground pool?
Yes — many SWG units are rated for above-ground pools and cost less ($400–$800). The plumbing is simpler: cell goes inline on the return hose after the filter.
Will the salt corrode my pool equipment?
At normal levels (~3,200 ppm — about one-twelfth the saltiness of seawater), modern pool equipment handles it fine. Keep salt under 3,500 ppm, and keep your water balanced; corrosion comes from neglect, not from salt itself.