Converting from Chlorine to Saltwater: Costs & Steps

Thinking about switching to saltwater? Excellent choice—saltwater pools still use chlorine, but your chlorinator makes it for you from dissolved salt, keeping levels steadier with far less day-to-day handling. Here’s Pool Life’s straightforward guide to costs, parts, and the exact steps to convert without surprises.

Switching to a saltwater pool. What changes (and what doesn’t)

• Same sanitiser, new delivery: A salt chlorinator (SWG) converts salt (NaCl) into chlorine as water passes a powered cell.
• Less fiddling: Set an output %, and the unit maintains Free Chlorine (FC) while the pump runs.
• Water feel: Slightly salty (typically 3,000–4,500 ppm), often described as “silkier.”
• Chemistry still matters: You’ll still need to balance pH, TA, CH, CYA, and clean the filter. SWGs work best when pH 7.2–7.6.

Typical costs (residential, ballpark)

• Salt chlorinator (cell + control box): AU$1,500–$4,000 (size & brand dependent)
• Plumbing install & commissioning: AU$90–$250
• Electrical (dedicated outlet/circuit by licensed electrician): AU$200–$600
• Initial salt load: AU$120–$300 (e.g., 150–225 kg for ~50,000 L)
• Stabiliser (CYA) top-up: AU$50–$120 (if needed)
• Optional automation integration: AU$200–$800
• Future salt cell replacement (every ~3–7 years): AU$400–$900

(We’ll quote your pool precisely; these are guide ranges.)

How much salt do I need?

Target salinity is usually 3,000–6,000 ppm (check your model).

Rule of thumb:

Salt (kg) = Pool litres × desired ppm ÷ 1,000,000

Examples to reach ~3,500 ppm from zero:

• 30,000 L → ~105 kg
• 40,000 L → ~140 kg
• 50,000 L → ~175 kg
• 60,000 L → ~210 kg

If you already have some salt (past tablet use, etc.), test first and add only the difference.

The Pool Life conversion—step by step

1) Pre-check & sizing

• Confirm the pump, filter, and heater are salt-compatible and meet the minimum flow for the chosen SWG.
• Size the chlorinator to at least your pool volume—in hot, sunny climates, we favour one size up.
• Decide on automation (timers/ORP/pH control) if desired.

2) Plumbing the cell (after the filter)

• Install the cell after the filter and heater, before any chemical injection points.
• Maintain straight pipe runs as per the manual for the flow switch.
• Use unions for easy removal; check for leak-free joins.
• Mount the control box clear of sun/rain; ensure earthing/bonding is correct (licensed electrician).

3) Prepare the water

• Balance TA → pH → CH first.
• Set CYA to the SWG-friendly range (10–30 ppm).
• Bring FC to 1–3 ppm (you’ll fine-tune after salting).

4) Add salt (broadcast, don’t dump)

• Use pool-grade salt. With the pump running, broadcast over the deep end; brush any piles to dissolve.
• Circulate 24 hours, then test salinity with a meter; top up if needed.
• Don’t place bags on paving; rinse away spilled salt to protect stone/metal.

5) Commission the SWG

• Set initial output (e.g., 40–60%) and run time (longer at low pump RPM is best).
• Confirm “flow” and “salt level” indicators are happy.
• After 24–48 hours, test FC and adjust output or run time to hold 2–4 ppm consistently.

6) Week-one dial-in

• Test FC & pH every 1–2 days; tweak output 5–10% at a time.
• If FC drifts low after a party or storm, boost with liquid chlorine, then let the SWG maintain.

Maintenance differences with salt

• pH tends to drift up (aeration at the cell). Keep TA at the low-to-mid range and add small acid doses as needed.
• Cell scaling: Inspect monthly; clean only when you see scale. Use the manufacturer’s cleaner or a mild acid wash (avoid over-acid cleaning, as it shortens the product’s life).
• Winter: Many SWGs reduce output in cold water—supplement with a bit of liquid chlorine if required.
• Corrosion care: Rinse metal fixtures and seal soft stone coping; keep equipment and storage areas tidy and dry.

Pros & cons at a glance

Pros

• Very steady chlorine level day to day
• Less manual handling of chemicals
• Great swimmer comfort; fewer peaks/odours
• Works beautifully with variable-speed pumps (run longer on low)

Cons

• Upfront cost and cell replacement every few years
• Needs pH management and occasional cell cleaning
• Salt mist/splash can bother unsealed soft stone and nearby metals (use sealers/rinsing)

Common mistakes (easy to avoid)

• Undersized unit: It will run at 100% efficiency and still fall behind in the summer. Go bigger.
• Skipping CYA: Low stabiliser = chlorine burns off; high stabiliser = chlorine acts sluggishly—aim for 10–30 ppm.
• Dumping salt in one spot: It cakes. Broadcast and brush.
• Shocking with the SWG: Use liquid chlorine for big recoveries; SWGs are for maintaining.
• Frequent strong-acid washes: Only clean the cell when needed, and follow dilution guides.

FAQs

Will my pool taste salty?

Barely. At ~3,500 ppm, it’s about one-tenth the ocean’s concentration—most people can’t taste it.

Do I still need tablets?

Not routinely. Keep a few for holidays, but remember trichlor adds CYA.

Can I convert any pool?

Most modern systems convert easily. We’ll check the heater and light fittings for salt compatibility and confirm the electrical supply.

What Pool Life does for your conversion

• On-site audit & sizing: Equipment, flow, electrics, and tailored recommendations
• Supply & install: Chlorinator, unions, timers/automation, and neat cabling
• Chemistry setup: Salt/CYA calculations, initial balance, and week-one tuning
• Owner handover: Simple output/run-time plan and quick-fix playbook
• Aftercare: Cell inspections, pH control tips, and seasonal service