Start Your Salt Chlorine Generator

Check Water Balance Before Startup

If your plaster is new or resurfaced, wait out the curing periods required by your builder, finish maker and cell manual before adding salt. Converting an existing pool has a different starting point. The CircuPool SJ manual requires at least 30 days, and you must wait longer if the builder specifies. Keep the cell off until salt has fully dissolved, an independent test confirms it’s within that model’s range, and startup requirements are met. Maintain FC manually as the chlorine label directs while you wait.

Before startup, compare your water balance with the limits in your exact cell manual. Assess calcium-carbonate scale using pH, carbonate alkalinity and calcium hardness, along with temperature and dissolved solids. A dose calculation cannot clear a pool for swimming. Before anyone swims, test free chlorine (FC) and pH. Keep pH at 7.2–7.8, with clear water, the bottom visible and no visible algae. FC must meet both the minimum for measured CYA and the chlorine label’s re-entry range. CDC minimums are 1 ppm without stabilizer and 2 ppm with it; a pool with CYA can require more. Test FC and pH at least twice daily, and more often during heavy use.

Add the Initial Salt

Use pool-grade salt with at least 99.8% NaCl, or higher purity if your model manual requires it. Do not use rock salt, table salt or iodized salt. With the pump running, spread salt across the shallow end as the manual directs. Keep it out of the skimmer.

Circulate for at least 48 hours and until all salt has dissolved. Follow a longer wait if your model manual or conditions require it. Test the fully mixed water independently before calculating another addition.

Choose CYA for Your Generator

Take the CYA target from your exact cell manual, then set FC from the CYA you measure. Test whether the cell holds that FC target and adjust its output from the results.

Set FC from measured CYA, then test whether the cell is maintaining that target. A dose calculation cannot clear a pool for swimming. Before anyone swims, test free chlorine (FC) and pH. Keep pH at 7.2–7.8, with clear water, the bottom visible and no visible algae. FC must meet both the minimum for measured CYA and the chlorine label’s re-entry range. CDC minimums are 1 ppm without stabilizer and 2 ppm with it; a pool with CYA can require more. Test FC and pH at least twice daily, and more often during heavy use.

Cell Maintenance

Inspect your salt cell at the interval in its manual. When output drops, first check salt, temperature, flow and settings. If you find deposits, use the approved cleaning method, starting with a rinse or a permitted non-acid method where directed. Use acid only when the manual calls for it, with that model’s dilution and contact time. Unnecessary or excessive acid cleaning damages the coating. Take the cleaning schedule and soak instructions from your own cell’s manual.

To assess scale, consider calcium hardness alongside pH, carbonate alkalinity, temperature and dissolved solids. Use the calcium hardness calculator to estimate a calcium addition if your chosen target calls for one.

Monitor the First Month

Follow your model manual and watch the test results closely while you adjust output:

1. Days 1–3: Run pump 24/7 to dissolve salt. Allow at least 48 hours and any longer manual interval before independently testing fully mixed salt. Keep chlorinating by hand this whole time. The cell stays off until salt is in range, so follow the liquid chlorine label to sanitize the water.
2. Once salt has fully mixed: Test salt independently and compare it with the model manual. If it is still low after at least 48 hours, or the longer manual interval, calculate a new addition from that reading. Never add the original remainder automatically.
3. When startup checks are complete: Start with the initial output setting in your exact model manual. Test FC and pH at least twice daily and adjust output until it holds the target for your CYA reading.
4. Week 2: Test FC and pH at least twice daily. Track alkalinity too. Carbon dioxide leaving the water can raise pH without raising alkalinity; aeration can speed that loss. If pH keeps rising while alkalinity holds, assess aeration and water balance. Acid lowers both pH and alkalinity, so use fresh readings to calculate an addition instead of adding it on a fixed schedule. Follow the acid label for application.
5. Week 3: Retest CYA after the stabilizer label’s full testing interval. Compare the reading with your model’s target before adjusting. Continue checking FC and adjust output or hand-dose chlorine as its label directs, using those readings to maintain your target.
6. Ongoing: Test FC and pH at least twice daily, more often during heavy use or treatment. Use those results to adjust output, and keep checking that the cell is holding your chlorine target.

Startup Mistakes to Avoid

1. Running the cell before salt dissolves. The cell reads low salt and may not produce chlorine. Allow at least 48 hours of circulation, or longer per the exact model manual or conditions, and independently verify fully dissolved salt is within the model’s operating range before turning on the cell.
2. Ignoring pH drift. Track pH and alkalinity from fresh tests. Carbon dioxide loss can raise pH without changing alkalinity; the rate varies with the water and aeration. Do not add acid on a fixed schedule. Use the pH calculator to estimate an addition, then follow the acid label for application.
3. Not adding CYA. A salt cell generates unstabilized chlorine, just like liquid chlorine. Set CYA according to the exact model manual and monitor FC against measured CYA. Calculate your CYA dose, then apply it as the stabilizer label directs.
4. Setting output too high. Set initial output as your exact model manual directs, then adjust it from FC and pH tests at least twice daily. Cell capacity, runtime and chlorine demand all affect the output you’ll need.
5. Using the wrong salt. Use the pool-grade salt your model manual permits, with at least 99.8% NaCl or its higher required purity. Do not substitute rock salt, table salt or iodized salt. Check the label for additives; impurities can stain surfaces or damage the cell.

Frequently Asked Questions

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