How a saltwater pool actually works
A saltwater pool is a chlorine pool. Salt dissolved in the water, usually around 3,000 ppm, passes through an electrolytic cell where a low-voltage current splits it into chlorine gas that dissolves immediately into the water as hypochlorous acid, the same sanitizer a tablet or liquid chlorine produces. The chlorine does its job, reverts back to salt and the cycle repeats. The result is a steady, low-level chlorine feed that many homeowners in Madison and Ridgeland find easier on skin and eyes than dumping chlorine in once a week.
The system depends on a few things being right: enough salt for the cell to work, clean cell plates, water warm enough for the cell to run (most cells shut down below about 60 degrees), enough pump run time for the cell to produce what the pool needs, and water chemistry that does not scale or corrode the cell. Saltwater pool service in Madison, MS is about watching all of those.
Salt cell inspection and cleaning
The cell is the heart of the system and the part that fails most often. Calcium scale builds up on the titanium plates, especially in a pool with high pH or high calcium hardness, and once the plates are coated the cell produces less chlorine and the control box starts throwing low-salt or check-cell warnings even when salt is fine. Our $95 saltwater system service covers pulling the cell, inspecting the plates for scale and wear, and cleaning it with a diluted muriatic acid soak only as long as needed to dissolve the scale. Over-acid-washing shortens cell life, so we do not leave it soaking all day.
We also inspect the flow switch, check the unions and o-rings for leaks, verify the control box reading against a hand-tested salt level, check the output percentage setting and look at the cell's run hours. Cells are consumable; most are rated for a set number of hours and start losing output after several seasons. Knowing where yours stands lets you budget for a replacement instead of getting surprised in June.
- ■Remove and inspect cell plates for scale, pitting and wear
- ■Acid-clean scale only as long as needed
- ■Verify salt level with an independent test
- ■Check flow switch, unions, o-rings and control box readings
- ■Review output setting and pump run time against chlorine demand
- ■Record cell condition and estimated remaining life
Chemistry targets specific to saltwater pools
Salt pools run slightly different numbers. Cyanuric acid is held higher, typically 60 to 80 ppm, because the cell produces chlorine slowly and the stabilizer needs to protect that small amount from Mississippi sun. Free chlorine target is still 1 to 3 ppm; the cell should be set so it holds that range over the pump's daily run time.
The biggest ongoing issue is pH. The electrolysis process pushes pH up constantly, so a salt pool in Madison County will need muriatic acid added regularly, often on every weekly visit in summer. Left alone, pH drifts to 8.0 or higher, chlorine effectiveness drops and calcium scales onto the cell plates and tile. Alkalinity is kept toward the lower end of the range, around 80 ppm, to slow that drift. Calcium hardness is held in the 200 to 400 ppm range, and salt level is kept where the cell manufacturer specifies, typically 2,700 to 3,400 ppm.
Salt does not evaporate or get used up, so it only needs to be added after heavy rain overflow, backwashing, splash-out or a drain. Adding salt when the box says low without testing first is how people end up at 5,000 ppm and corroding their equipment.
Weekly saltwater pool maintenance
Weekly service on a salt pool covers the same work as any pool: skimming, brushing walls and tile, emptying skimmer and pump baskets, vacuuming, full water testing and balancing, filter pressure check and blowing off the deck. What changes is the emphasis. We check the cell reading and control box status on every visit, add acid to control pH, watch for scale on the waterline tile and step edges, and make sure pump run time is long enough for the cell to produce what the pool needs in the heat.
Saltwater pools still get algae. When bather load spikes on a holiday weekend, or a storm dumps debris in, the cell cannot ramp up instantly the way a dose of liquid chlorine can. On those weeks we supplement with liquid chlorine or shock the pool conventionally rather than cranking the cell to 100 percent and burning it out. Phosphate testing matters on salt pools too; a cell can be producing plenty of chlorine and still lose to algae that is being fed by fertilizer runoff.
Common saltwater problems in Madison County pools
The most frequent call we get for saltwater pool service in Madison, MS is a pool going green while the control box says everything is fine. Nine times out of ten the cell is scaled, past its life or the box is misreading salt. We hand-test salt, inspect the cell and tell you which it is.
Scale on the waterline tile and rough spots on steps are the second complaint, and they come from high pH and high calcium allowed to run for months. Corrosion of ladders, handrails, light rings and heater components is the third, and it comes from salt combined with low pH or poor bonding. Regular pH control prevents most of it. The fourth is deck and coping damage from salt splash-out on soft stone; rinsing the deck and keeping salt at the low end of the cell's range helps.
Winter shutdown and spring startup for salt systems
Salt cells stop producing when water gets cold, usually below around 60 degrees, which in the Jackson metro means from late November into early March. During that time the pool still needs some chlorine, so we either add liquid chlorine on winter visits or leave a small tablet feed running. In spring the cell comes back online, and that is the right time for a cell inspection and cleaning so it starts the season producing at full output.
Spring startup also means rechecking salt after winter rains have diluted the pool, setting CYA back into the 60 to 80 range and getting pH under control before the water warms up and demand climbs.
Converting to salt or fixing a system that never worked right
If you are thinking about converting a chlorine pool in Ridgeland, Gluckstadt or Flowood to salt, we can tell you honestly whether it makes sense for your pool and equipment. Salt systems pay off in convenience and consistent water, but they are not free to run: cells need replacement every few seasons, acid use goes up and stone decks and older metal fixtures need to be considered.
If you already have a salt pool that never seemed to keep up, the fix is usually a combination of a proper cell cleaning, correcting CYA and pH, and running the pump long enough. Call 601-967-1717 and we will come look at the whole system, not just the cell.
Where we work
Saltwater Pool Service is available across Madison County and the Jackson metro — Madison, Ridgeland, Gluckstadt, Canton, Flora, Flowood, Brandon, Jackson, Clinton, and Pearl.
Questions we get
Does a saltwater pool still need weekly service?+
Yes. The cell makes chlorine but does not brush, vacuum, control pH or clean the filter. Salt pools also push pH up constantly and need acid added regularly.
How often should the salt cell be cleaned?+
Inspect it every few months during the season and clean it when scale is visible on the plates. Pools with high calcium or pH need it more often. Our system service is $95.
Why is my salt pool green if the box says salt is fine?+
Usually a scaled or worn-out cell, a control box misreading salt, high CYA or not enough pump run time. We hand-test salt and inspect the cell to find out which.
What salt level should my pool be at?+
Whatever the cell manufacturer specifies, usually between 2,700 and 3,400 ppm. Test before adding salt; it does not evaporate and too much corrodes equipment.
Do I need to add chlorine to a salt pool?+
Sometimes. After heavy use or storms, or in winter when the cell shuts down for cold water, supplementing with liquid chlorine is normal and better than overworking the cell.
Why does my salt pool taste salty?+
It should, faintly. The cell needs about 3,200 ppm, a tenth of the ocean. If it tastes strong, the reading is likely over 3,500 and a partial water swap brings it down.
Why does scale keep building on my salt cell?+
Cal-hypo shock adds calcium every dose, hard fill water adds more, and evaporation leaves it all behind. Over 400 ppm it scales tile and the cell plates. The fix is switching to liquid chlorine when you need to shock and partial water swaps.
How long should the pump run on a salt pool?+
Eight to twelve hours a day in a Mississippi summer, in daylight when the sun is working against you, because the cell only makes chlorine while water is moving through it. A variable-speed pump can run longer on low and cost less.