How to Convert a Chlorine Pool to Saltwater
A saltwater pool is still a chlorine pool 鈥?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鈥?2,000 (Hayward AquaRite and Pentair IntelliChlor are the most common), installed
- Salt for startup: $60鈥?150 depending on pool size (use our salt calculator for your exact number)
- Cell replacement: every 3鈥? years, $300鈥?800 鈥?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 鈥?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鈥?400.
- 4. Add salt. Calculate the exact amount with our pool salt calculator 鈥?most pools going from 0 to 3,200 ppm need 250鈥?50 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鈥?0 ppm with our CYA calculator 鈥?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鈥?: Set a routine 鈥?test FC and pH twice a week, salt once a week. Your cell's manual lists the target FC (usually 2鈥? 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 鈥?always wait the full dissolve time.
- Skipping CYA entirely 鈥?the #1 cause of "my cell can't keep up".
- Using rock salt or water-softener salt with additives 鈥?pool-grade sodium chloride only.
- Never testing again after install 鈥?salt pools still need weekly testing; they're lower maintenance, not zero maintenance.
Frequently asked questions
Is a saltwater pool actually chlorine-free?
No 鈥?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 鈥?many SWG units are rated for above-ground pools and cost less ($400鈥?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 鈥?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.