Saltwater Pool Startup Guide

Before You Start the Cell

A salt cell will not run below a minimum salt level (typically 2,700 ppm under the ANSI/APSP/ICC-11 standard; check your cell's label for the exact minimum). Do not turn on the SWG until you have added salt and tested that the reading is in range. Running a cell in low-salt water can damage the electrode plates.

Also required before startup: pH must be 7.2–7.4. High pH causes calcium scale to form on the cell plates, reducing output and cell life.

Initial Salt Loading

Use pool-grade salt (99.8% pure NaCl). Do not use rock salt, table salt, or iodized salt. Broadcast the salt across the shallow end of the pool with the pump running, not directly into the skimmer.

Run the pump for about a full day after adding salt before testing. Salt dissolves slowly and needs full circulation to read accurately.

CYA Requirements for SWG Pools

Saltwater pools require higher CYA than chlorine pools: 60–80 ppm under the ANSI/APSP/ICC-11 standard. The salt cell generates chlorine continuously, but without adequate CYA, UV destroys it before it can sanitize.

Higher CYA (60–80 ppm) means higher FC. The math: on the ANSI/APSP/ICC-11 CYA/FC sliding scale, 70 ppm CYA needs 5 ppm FC minimum. Set SWG output to hold FC in the 7–10 range.

Cell Maintenance

Clean your cell every 90 days or when output drops (per ANSI/APSP/ICC-11 maintenance guidance and manufacturer recommendations; check your cell's manual for your specific model). Check by looking for calcium scale (white deposits) on the plates. Clean with a 4:1 water-to-muriatic acid solution. Soak for 15 minutes, rinse thoroughly.

Keep calcium hardness at 200–400 ppm. Calcium above 400 ppm accelerates scale buildup on the cell plates, shortening cell life. Use our calcium hardness calculator to check if you need to adjust.

The First 30 Days

The first month of SWG operation requires more attention than steady-state maintenance. Here is the checklist:

1. Days 1–3: Run pump 24/7 to dissolve salt and establish chlorine production. Test salt level at the 24-hour and 48-hour marks.
2. Day 3: Verify salt reading is in target range (3,000–3,500 ppm under the ANSI/APSP/ICC-11 standard and the SWG manufacturer's label). If low, add more salt and run another full day.
3. Days 3–7: Set SWG output to 50% and test FC daily. Adjust output up or down to hit your target FC (5–7 ppm at CYA 60–80, following ANSI/APSP/ICC-11 SWG operating guidance).
4. Week 2: Test pH twice. SWG pools trend high on pH because the chlorine generation process produces sodium hydroxide. Keep muriatic acid on hand.
5. Week 3: Verify CYA has fully registered (takes 7–10 days to dissolve). Adjust if below 60 ppm.
6. Week 4: Your SWG output percentage should now be dialed in. Test FC and pH weekly going forward.

Common SWG Startup Mistakes

1. Running the cell before salt dissolves. The cell reads low salt and either shuts off or runs at reduced output. Wait a full day with the pump running before turning on the SWG (per typical SWG manufacturer commissioning guidance from Hayward, Pentair, and similar brands).
2. Ignoring pH drift. SWG pools produce sodium hydroxide as a byproduct of chlorine generation. pH drifts up over time, often 0.1–0.2 per week. Budget for regular muriatic acid additions. Use the pH calculator to dose correctly.
3. Not adding CYA. A salt cell generates unstabilized chlorine, just like liquid chlorine. Without CYA, sunlight degrades that chlorine in roughly an afternoon. SWG pools need 60–80 ppm CYA. Calculate your CYA dose.
4. Setting output too high. Running the cell at 100% output shortens cell life and drives pH up faster. Most pools need 40–60% output in peak summer and 20–30% in shoulder seasons.
5. Using the wrong salt. Pool-grade salt (99.8% NaCl) is the only acceptable type. Rock salt contains minerals that stain. Table salt contains iodine and anti-caking agents that damage the cell.

Frequently Asked Questions

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