How to Use Your Salt Chlorine Generator

Setting Up and Adjusting Your Salt System

Once your system is installed and you’ve added salt, its overall operation is simple. The generator makes chlorine automatically every time your pump runs.

Your role is to set the output level so it produces enough to keep your pool sanitized — meaning that it constantly achieves 1–3ppm free chlorine in the pool. You’ll go through some initial steps to tailor its output to meet your pool’s unique needs, and then in the future you’ll make small adjustments to that level as your pool’s needs change through the season.

There’s no universal “right” percentage; you dial it into your pool. This guide walks through exactly how.

(Brand-new to it and still need to add salt or get the system running for the first time? Start with How to Add Salt to Your Pool and 5 Things to Know After Purchasing a Salt Chlorine Generator.)

What Your “Output” Setting Actually Controls

Your salt system’s control module allows you to adjust how much chlorine the cell produces while it’s running, as a percentage of its total capability (some models allow a half dozen settings from high to low, while others allow for more fine tune adjustments in as little as 1% increments). The higher the percentage output you set, the more chlorine generated while the pump runs — and the more of the cell’s lifespan you use up (so there is no reason to set it higher than needed and overchlorinate your pool).

A helpful way to think about it: 8 hours of running at 100% would create the same amount of daily chlorine for your pool as running 16 hours at 50%. Salt chlorinators are designed with the assumption that you have a typical run time for your pool pump — usually 8 to 12 hours a day. If you have a very long pump run time (with a variable-speed pump, for example), you’ll likely end up needing to use a lower chlorine output setting (or even use a timer to have the salt chlorinator run less hours during the day — recommended). If you have a shorter pump run time for some reason, you’ll likely end up needing to use a much higher output setting.

This guide will assume a typical pump run time, but as long as you don’t have too short of a run time you’ll hone in on the output setting your pool needs if you follow the process.

What Setting Should My Salt Chlorine Generator Be On?

Remember  — there’s no single correct percentage that your salt system needs to be set on based on your pool size.. The setting you need is simply the one that consistently achieves a 1–3 ppm free chlorine level. That idea is simple, but since there are a number of factors at play that makes the output setting your system needs unique to your pool.

Your Pool’s Chlorine Demand

To achieve 1–3 ppm in your pool, your system needs to generate enough chlorine every day to slightly exceed your pool’s “Chlorine Demand”. Demand is how much chlorine your pool burns through in a day, and it’s driven by things like:

• Water Chemistry — your balance directly affects how stable and effective your chlorine is, and the rate at which microorganisms are able to grow.
• Sunlight & heat — more UV and higher temps burn off chlorine faster, and also enable microorganism growth.
• Bather load — more swimmers means more demand
• Weather — storms and heavy rain dilute and disrupt your water chemistry
• Surroundings — lots of trees, landscaping, or wind adds organic load & increases demand.

Chlorine demand is a dynamic, cumulative effect. It won’t be the same even for two similar pools next door to each other. That’s why the setup process for your salt system takes you through steps to tailor its output based on your unique pool’s needs.

How to Initially Set Up Your Salt Chlorine Generator, Step by Step

Give yourself about a week or so to monitor and adjust your system. A well set chlorine generator not only ensures a well balanced pool, it also ensures your system isn’t working harder than it needs to and lasts as long as possible.

1. Start around 70%. Make sure you are starting with completely balanced pool water and confirmed salinity. When the system first starts up, set the system’s output near 70% as a baseline. Tip: at startup, monitor the unit for the first 5–10 minutes to double check that no error lights trigger for any reason.
2. Give it a 1–2 days. Let the system run on your normal pump schedule.
3. Test your free chlorine. Compare the results you get. You’re aiming for 1–3 ppm — the target range to protect your pool from microorganisms. (More on targets: Salt Water Pool Chemistry.)
4. Adjust your system’s output. If the free chlorine level is too high → lower the setting incrementally. If your free chlorine level is too low → raise the setting. Make adjustments to the output setting based on how much or how little the free chlorine level might be off.
5. Repeat. Continue to test your resulting free chlorine and make adjustments until the level holds steady over several days at 1–3 ppm. That’s your pool’s chlorine output setting — for now.

Note: starting at 70% output above is a rule of thumb. If you have other information to go on (for example, you chose a very powerful model, or you know that you have atypical run times) that might suggest starting with a different number, then you can make that determination. Just know it can be better to start higher than needed and adjust downwards. If you start off too low and aren’t very attentive, then you run the risk of ending up with too little chlorine or even a growing algae problem.

How to Adjust Your Salt Chlorine Generator Later On

Your Setting Isn’t “Set and Forget Forever.”

Boost Mode & Seasonal Adjustments

Expect to turn it up as spring moves to summer (more sun, heat, and swimmers) and down as things cool off. After a storm, a big party, or any time the water looks off, using your system’s Boost / Superchlorinate mode can be a convenient way to compensate for temporarily increased chlorine demand — just know this feature raises chlorine output to 100% (usually for 24 hours of run time) and won’t exceed it. If you’re already running at a high output and need additional chlorination, you can always supplement with chlorine (liquid suggested), but in such situations you should also take a look at other factors that might be in play.

Checking for Warning Lights

If for any reason an error occurs (for example, the pool’s salinity eventually gets too low due to rain throughout the season), a warning light will typically come on, and the system will stop generating chlorine. The sooner you fix the issue, the better — and the more likely it is that you can continue on with the chlorine output setting that you have without issue. If a salt chlorine generator sits idle, you might end up needing to run it on high to catch up (or even add shock to kill off any algae if it forms in the interim).

Part of using the system is knowing what its lights mean. Most units flag low/high salt, a cell that needs inspection or cleaning, no flow (the safety feature that stops chlorine production when water isn’t moving), and high/low water temperature. A red light generally means the unit has stopped generating until the issue is addressed. When one comes on you’ll want to address it quickly to restore chlorine generation; if needed, use our salt chlorine generator troubleshooting guide (bookmark it for later).

When Your Setting Won’t Hold

If you’re running high output and still can’t hold 1–3 ppm, and assuming you’re giving the system sufficient daily run time and there are no warning lights, this is usually a symptom of excessive chlorine demand. Check, in order:

• CYA (stabilizer) — too little and sunlight burns chlorine off fast; too high and chlorine gets sluggish.
• High pH — this can cause the chlorine to be slow acting, allowing microbes to grow faster than they are killed off
• Phosphates and Nitrates — be sure these are measured on your chemistry reports. These nutrients can allow fast microorganism growth and rapidly deplete chlorine levels.

You can read more about Salt Water Pool Chemistry and Low Chlorine Troubleshooting.

Fitting It Into Your Routine

Setting the output is the salt-specific part of pool care — the rest of your routine (testing, balancing pH, brushing, skimming, filter care) stays the same. For the full rhythm, see our salt water pool maintenance guide. Best practices are to continue to test your water chemistry frequently (weekly is ideal), and use that habit as an opportunity to make adjustments to your salt chlorinator if the free chlorine level begins to read lower on your chemistry report. For the most part, you should see free chlorine levels staying consistent, but frequent testing allows you to catch it when seasonal changes start to demand that you adjust your salt system.

Still Dialing It In?

Every pool is different — sometimes setting up your salt chlorinator is easy, and sometimes a little advice is helpful. Stuck? Call our salt pool experts at 866-766-5243 — we’ll help you find your setting.

If you’ve installed your salt chlorine generator and are in the process of setting it up, don’t forget to cover all the bases in our 5-point checklist for new salt systems.

If you’re done with setup and are loving how much easier it has made pool ownership — check out how things can get even better, with our complete pool modernization guide.

FAQs