Saltwater pools are great, but there is one thing every saltwater pool owner eventually learns: the salt cell doesn't last forever.

A salt cell is a wear item. Every hour it spends producing chlorine uses a little bit of its available life. Eventually, even a clean and properly maintained cell will reach the point where it can no longer produce chlorine effectively.

That doesn't mean there's anything wrong with saltwater pools. It just means the cell needs to be treated like the piece of equipment it is.

The good news is that how you operate and maintain your pool can make a big difference in how much useful life you get out of it.

How Long Does a Salt Cell Last?

You'll commonly hear that a salt cell lasts three to five years. That's a decent general estimate, but it doesn't tell the whole story.

A better way to think about salt-cell life is in operating hours.

Some salt chlorine generators are designed around approximately 10,000 hours of chlorine production. How quickly you use those hours depends heavily on how the pool is operated.

That's especially important here in Florida.

Our pools don't get much of an off-season. Warm water, strong sunlight, heavy rain and a long swimming season can keep chlorine demand high for much of the year.

A cell running at 30 or 40 percent isn't doing the same amount of work as one that's constantly being asked to run at 100 percent.

That difference adds up over time.

What Actually Wears Out?

Inside the salt cell are specially coated metal plates.

As saltwater passes through the cell and electrical current is applied, the cell uses electrolysis to generate chlorine. That chlorine sanitizes the pool and eventually converts back into chloride, allowing the process to continue.

But the coating on those plates has a finite service life.

As the cell accumulates operating hours, its ability to efficiently produce chlorine eventually declines.

There isn't a chemical you can add to reverse that.

There isn't a cleaning procedure that makes a worn-out cell new again.

At some point, replacement is simply part of owning a saltwater pool.

Does Running a Salt Cell at 100% Shorten Its Life?

This is one of the biggest things homeowners should understand.

The percentage setting on a salt chlorine generator controls how much of its available operating time the cell is actually producing chlorine.

If the system is set to 50 percent, for example, the cell isn't normally producing chlorine continuously during the entire pump cycle. It cycles its chlorine production according to the selected output.

Turn that output up and the cell works more.

Sometimes that's exactly what the pool needs.

But 100 percent shouldn't automatically be the permanent setting just because more chlorine sounds better.

The goal is to find the output and pump runtime that maintain the proper chlorine level for your particular pool.

If 50 percent keeps the pool where it needs to be, there isn't much reason to run the cell at 100 percent all year.

You're just using its available life faster.

Florida Pools Make Salt Cells Work

This deserves its own mention because advice that works for a pool somewhere else in the country doesn't always translate perfectly to Florida.

Our pools deal with a lot.

We have intense sun, warm water, heavy summer rain, long swimming seasons and plenty of organic material getting into the water.

All of those things can affect chlorine demand.

That's why I don't like the idea of a universal "perfect" salt-cell percentage.

One pool might maintain beautifully at 40 percent while another needs 70 percent during the same time of year.

Test the water and adjust the cell based on what the pool actually needs.

That's better than picking a number and leaving it there forever.

Keep the Salt Where It Belongs

Your salt chlorine generator needs the proper salinity to operate correctly, but more salt isn't necessarily better.

Different manufacturers and models have their own operating ranges, so the correct salt level should be based on the equipment installed on the pool.

Here's something we see in the field that can cause confusion:

The salt reading displayed by the system and an independent water test don't always agree.

If the automation says the salt is low but a reliable independent test says otherwise, don't immediately start dumping bags of salt into the pool.

First figure out why the readings don't agree.

The problem could involve the cell, a sensor, calibration, temperature, scale or a cell that's simply getting older.

Adding salt without verifying the actual salinity can leave you with an entirely different problem.

Water Chemistry Matters Too

A salt cell doesn't operate in isolation. The chemistry of the entire pool affects it.

One of the biggest things we watch is pH.

Saltwater pools have a tendency to require regular pH management. If the water gets out of balance, calcium scale can become a problem.

That white buildup you see on a salt cell isn't something you want to ignore.

Scale can coat the plates and interfere with the cell's ability to operate efficiently.

Keeping pH, alkalinity, calcium hardness, stabilizer and salt within the appropriate ranges helps the entire system operate the way it was designed.

And keeping the water balanced can mean less unnecessary cleaning of the cell.

Don't Automatically Acid-Wash Your Salt Cell

This is another area where more maintenance isn't necessarily better maintenance.

A salt cell should be inspected before it's cleaned.

If there isn't meaningful scale buildup on the plates, don't acid-wash it just because a certain amount of time has passed.

Acid cleaning has a purpose, but it shouldn't become routine simply for the sake of doing it.

Manufacturers provide specific procedures for cleaning their cells, and those instructions should be followed.

The better approach is to keep the pool chemistry under control so heavy scale doesn't continually build up in the first place.

Signs a Salt Cell May Be Getting Tired

A failing salt cell doesn't always suddenly stop working one morning.

Sometimes the signs are gradual.

You may notice the pool requires a higher output percentage than it used to. Chlorine levels may start struggling even though the pump schedule hasn't changed. The system may repeatedly display a Check Cell or low-salt warning.

You might also see the salt reading reported by the system drifting farther away from an independent salt test.

Age matters too.

If we're troubleshooting a cell that's several years old, its age and operating history become part of the diagnosis.

But none of these symptoms, by themselves, automatically prove that the cell is bad.

Don't Condemn a Salt Cell Based on One Warning

This is probably the biggest point I want homeowners to take away from this article.

Test before you replace.

If a system reports low salt, verify the actual salt level.

If chlorine is low, look at the entire pool before blaming the cell.

Check the chemistry. Check the pump runtime. Check the output setting. Inspect the cell for scale. Make sure there's adequate flow. Look at the age of the equipment and any diagnostic information the system provides.

Sometimes the cell is bad.

Sometimes it isn't.

We've seen systems report a salt level that doesn't match our independent testing. We've also seen older cells continue working after cleaning or correcting another issue with the system.

A salt cell isn't cheap. We aren't interested in replacing one just because a light came on.

How to Get the Most Life Out of Your Salt Cell

You don't need to baby the equipment. You just need to operate it correctly.

• Keep the pool chemistry balanced.

• Maintain the salt level recommended for your specific system.

• Don't add salt based solely on a questionable electronic reading.

• Adjust chlorine output based on actual chlorine demand.

• Don't run 100 percent output unnecessarily.

• Inspect the cell for calcium buildup.

• Clean the cell when it actually needs cleaning.

• Follow the manufacturer's cleaning procedure.

• Keep proper water flow through the system.

• Pay attention when the pool suddenly requires significantly more output than it used to.

None of these things will make a salt cell last forever.

They can, however, help you avoid wasting the life it has.

Eventually, Every Salt Cell Reaches the End

Saltwater pools are sometimes marketed in a way that makes the system sound almost maintenance-free.

They're not.

A salt chlorine generator is simply another way of providing chlorine to the pool, and the cell doing that work is a consumable piece of equipment.

Eventually it wears out.

When that happens, replacing it isn't necessarily evidence that the system was poorly maintained or that something went wrong. Sometimes the cell has simply produced all the chlorine it was designed to produce.

The important part is knowing the difference between a cell that needs some attention and one that's actually at the end of its life.

That's where proper testing matters.

Saltwater Pool Service in Port St. Lucie

At Pool Pro Florida, we service saltwater pools throughout Port St. Lucie and the surrounding area.

We test the water, monitor salt and chlorine production, inspect the equipment and make adjustments based on what the pool actually needs.

If your salt system keeps showing a low-salt warning, Check Cell message, isn't maintaining chlorine, or you simply aren't sure whether the cell is still doing its job, we can take a look before you start replacing equipment.

A warning light gives us somewhere to start. It doesn't always give us the answer.