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The most requested feature of the last five years, and the most misunderstood. Here is what salt actually does, what it genuinely gives you, and what it quietly asks for in return.
This is the single most important sentence on this page, and almost nobody is told it before they sign. A salt system does not replace chlorine. It manufactures chlorine, continuously, inside your own plant room, from the salt dissolved in your water. The sanitiser doing the work in a salt pool and the sanitiser doing the work in a conventional pool are the same chemical.
What changes is the delivery method. Instead of someone tipping a measured dose into the water every morning, a cell in the plant room produces a small, steady, continuous amount all day. That single difference is responsible for nearly every benefit people associate with salt water — and it is a real benefit. But it is a benefit of automation, not of chemistry.
Understanding that properly changes what you should expect, what you should ask for, and where the money actually needs to go.
Three steps, running in a continuous loop for as long as the filtration pump is on.
Pool-grade salt is dissolved into the water, typically to around 3,000 parts per million. For scale: seawater is roughly ten times saltier. At this level most swimmers notice a very faint softness in the water and nothing more. It is close to the salinity of your own tears, which is precisely why it does not sting.
Water passes through an electrolytic cell — a set of coated titanium plates carrying a low-voltage current. The current splits the dissolved salt and produces chlorine, which immediately becomes hypochlorous acid: the same active sanitiser produced by any chlorine product on the market.
Once the chlorine has done its work, it reverts to salt. The salt is not consumed — it cycles. You top it up only for what is lost to splash-out, backwashing and rain dilution, not for what the system uses. This is genuinely elegant engineering, and it is the real reason salt systems are worth considering.
It does feel better. But not for the reason most brochures give you — and the reason matters, because it can be achieved without salt too.
Hand-dosing creates a peak every morning and a trough by evening. Swim at ten in the morning and you meet the peak. Continuous generation flattens that curve entirely — the residual sits at a steady, modest level all day.
The sharp smell and stinging eyes people call “too much chlorine” are not chlorine at all. They are chloramines — what forms when chlorine meets sweat, sunscreen and body oils. A steadier residual keeps ahead of them better. A strong pool smell is a sign of poor water, not strong water.
No drums to store, no tablets to carry, no operator judgement call every morning. For a private residence with domestic staff rather than a trained pool technician, this is often the strongest argument of the three.
Every one of those three benefits comes from consistent, automated dosing — not from salt. A conventional pool with proper automatic dosing and correctly held pH delivers most of the same comfort. If comfort is your only goal, salt is one route to it, not the only route. We will tell you that before you spend on it.
This is the part that gets left out of the sales conversation, and it is the part that decides whether your pool still looks new in year seven.
Salt in water means chloride in water. Chloride is what attacks the invisible protective film on stainless steel and causes the brown staining and pitting you see on so many older pools. The grade almost every Indian fabricator supplies as “marine grade” — 316 stainless — is generally considered dependable up to around 2,000 ppm of chloride. A pool held at 3,000 to 4,000 ppm of salt carries roughly 1,800 to 2,400 ppm of chloride.
In other words: a salt pool sits at or just past the practical service limit of the material most people assume is safe. It will usually survive. It will not always stay beautiful. On a project where a handrail is a design object rather than a utility item, that distinction is the whole conversation.
| Component | Common on a fresh-water pool | What we specify on a salt pool |
|---|---|---|
| Handrails, ladders, grating | 304 or 316 stainless | 316L minimum, electropolished; duplex where the piece is architectural |
| Heater / heat pump exchanger | Cupronickel | Titanium, without exception |
| UV chamber, if fitted | Standard stainless body | High-alloy body — the UV manufacturer must be told it is a salt pool at enquiry stage |
| Coping and deck | Limestone, travertine, softer sandstone all viable | Dense, low-porosity stone, sealed — soft porous stone erodes where splash-out dries |
| Fixings and anchors | Often mixed grades | Single grade throughout, dissimilar metals isolated |
Splash-out is the mechanism most people miss. Water lands on stone, the water evaporates, the salt stays and recrystallises inside the pores. Through a Delhi summer, with months between meaningful rain, that cycle repeats daily. It is not a chemistry problem. It is a materials-selection problem — and it is solved on a drawing, not on site.
Chlorinator manufacturers ask for salt that is at least 99.8% pure sodium chloride, evaporated, granulated and non-iodised. That is not a premium upsell. Almost all salt sold in India is iodised and treated with an anti-caking agent, and both cause problems here.
Manufacturers specifically warn against them — they can discolour fittings and pool finishes. The staining is permanent on some surfaces.
Interferes with the electrolysis reaction itself and shortens cell life. Pool salt is guaranteed iodine-free; table salt is guaranteed the opposite.
The impure fraction is rarely inert filler. Calcium scales the cell plates and reduces output; iron and copper stain new finishes, sometimes within hours of the first dose.
We name the salt grade in the handover documentation and in the annual maintenance schedule, because the cheapest way to ruin an expensive cell is to save a few hundred rupees a bag on the salt feeding it.
Salt removes a daily task and adds three periodic ones. Anyone who tells you it is set-and-forget has not maintained one through a North Indian summer.
Electrolysis drives pH upward as a matter of physics, not fault. Left alone, the water drifts high, the chlorine loses most of its killing power, and scale begins forming. A salt pool needs acid correction more often than a conventional one — ideally automated, not left to a daily judgement call. We hold total alkalinity at the lower end, 80–100 ppm, precisely to slow that climb.
Calcium scale on the cell plates is what kills most cells, and NCR groundwater is hard. A self-cleaning cell that reverses its own polarity is not a luxury feature here — it is close to mandatory. The cell still needs inspection on a fixed schedule, not when someone notices the water has gone cloudy.
Coated titanium plates have a finite service life — quality units are rated by their makers in operating hours, typically in the range of 8,000 to 15,000. It is a replacement item, not a permanent one, and its cost belongs in your running budget from day one. We put the expected replacement interval in writing at handover rather than letting it arrive as a surprise.
Where a resort pool needs both, we design for both: salt generation for daily comfort, with a conventional dosing route retained for peak load and remedial treatment. That is a design decision made at the plant room stage. It cannot be added afterwards.
Before You Commit
What grade of stainless are the handrails, and what chloride level is that grade rated for? Is the heat exchanger titanium? What salt specification goes in the handover documents? And what is the rated service life of the cell you are quoting? If the answers are vague, the corrosion bill is yours, not theirs.