Water, clarity and algae
Salt levels in a salt pool
A salt chlorinator makes chlorine from salt dissolved in the water. Too little and it stops producing; too much and it strains the equipment.
In a salt pool, the chlorinator cell converts dissolved salt into chlorine as water passes through it. Each cell has a salt range set by its manufacturer. Below it, chlorine production drops and some cells shut down or wear faster; above it, the system may report high-salt warnings and some metal parts are under more stress.
Water guides explain what a reading or a symptom means and the order in which to correct it.
Salt does not evaporate, so evaporation slowly concentrates it. It leaves the pool through backwashing, vacuuming to waste, splash-out and dilution when the pool is topped up or rained on. Salt is therefore added in response to a test, not on a calendar.
The short version
Follow the cell’s range
The manufacturer’s figure, shown in the manual or on the controller, is the target.
Dilution removes salt
Backwashing, draining and rain lower it; evaporation does not.
Test before adding
Too much salt can only be lowered by replacing water.
Managing salt
Testing independently
A salt test strip or meter confirms the level rather than relying on the cell display alone.
Adding salt
Pure pool salt is added in measured amounts, brushed to dissolve and circulated before the cell is relied on again.
When the display disagrees
A scaled cell or a worn sensor can read low even when salt is fine; cleaning the cell is checked before adding salt.
Check the salt when
The cell shows a low-salt warning
Confirm it with a separate test first.
After heavy backwashing or vacuuming to waste
Both remove salty water.
After rain or a large top-up
Fresh water dilutes the salt.
Common questions
Can I use table salt?
Use pool-grade salt without anti-caking agents or iodine, which can stain or cloud the water.
Why does the cell read low when the test is fine?
Scale on the cell plates or a sensor fault can cause false low readings.
Does salt damage the pool?
At the cell’s recommended level it is generally fine. High salt can affect some metal fittings and stone.
Related pool care guides
- Phosphates in pool waterAnother water problem with a related cause.
- A pool that turns cloudy after shockingAnother water problem with a related cause.
- Chlorine shock or non-chlorine shockA related choice about how the pool is looked after.
- Storing pool chemicals safely at homeA routine task that prevents the same trouble.
This guide sits under pool water treatment. Browse all pool care guides. We look after pools at homes and commercial properties across Dubai.
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Next step
Salt cell warnings?
Send your salt test result and a photo of the controller display. We will help work out whether it is the salt or the cell.