Salt Cell Run Time Calculator

Enter your pool details and salt cell rating. Submit to see the result above this form.

Example data table

These sample rows illustrate how settings change recommended runtime.

Saved calculation history

Your last 25 runs are stored in this browser session.

Why salt cell run time matters

A salt chlorine generator produces chlorine only while the pump is running, so run time becomes your dosing window. If run time is short, free chlorine can drift below target and algae risk rises within days. If run time is excessive, you may waste electricity, over-oxidize organics, and accelerate cell plate wear. This calculator links chlorine demand to practical settings you can repeat weekly.

Inputs that drive demand

Daily loss is shaped by sunlight, stabilizer level, temperature, and swimmer load. Many outdoor pools lose 1–3 ppm per day, while heat waves and parties can push demand to 4 ppm or more. Boost mode estimates the one-time raise from a measured FC to a target FC, helping you recover quickly after storms, heavy use, or missed pump time.

Reading your cell rating

Manufacturers publish output as pounds per day or grams per hour at 100%. A common residential cell may be rated around 1.2–2.0 lb/day, but real production can be lower due to scaling, low salt, or age. Use the efficiency field to model a 70–95% range, then refine it by comparing test results over several days. Cleaning plates and maintaining proper flow restores output stability.

Balancing pump hours and percent setting

The calculator reports two controls: hours needed at your chosen percentage, and the percentage needed for your available pump time. If required hours exceed your schedule, increase the percentage, extend pump time, or reduce demand with shade, better circulation, and consistent brushing. Storing multiple runs in the history table helps you spot patterns, such as weekend spikes or midweek dips.

Using safety and season factors

Safety buffer adds margin for weather swings, filter backwashing, and testing noise. Season factor scales demand for cooler weeks or peak summer without changing your core inputs. When water is cold, some systems automatically reduce production, so the temperature adjustment prevents optimistic estimates. Together, these factors support steadier sanitation while protecting your cell and pump from unnecessary runtime.

FAQs

1) Should I use Boost or Maintain mode?

Use Boost when FC is below target and you want an estimated recovery time. Use Maintain when FC is stable and you want to match everyday loss from sun, swimmers, and temperature.

2) Where do I find the salt cell output rating?

Check the cell label, manual, or product sheet. Ratings are often listed as lb/day, g/day, or g/hour at 100% output under ideal conditions.

3) Why does the calculator ask for efficiency?

Efficiency models reduced production from scale, aging plates, low salt, and imperfect flow. If your tests show FC falling despite adequate settings, lower efficiency to reflect real output.

4) What if required hours exceed my pump schedule?

Increase the percentage setting, run the pump longer, or reduce demand by improving circulation, limiting debris, and maintaining proper stabilizer. If you are already near 100%, your cell may be undersized.

5) Is the temperature adjustment mandatory?

No. It is a mild estimate to prevent overconfidence in colder water where many systems produce less. If your controller already compensates, keep season factor near 1.00 and rely on your testing.

6) How often should I re-check the settings?

Re-check weekly in summer, after heavy swimming, and after rain events. Also re-check after cleaning the cell, changing pump hours, or when you notice FC trends drifting for several days.

Formula used