"Salt water or chlorine" is one of the most common questions buyers ask, and it usually comes with a built-in assumption that salt means no chemicals. That part is a misunderstanding worth clearing up first. After that, both approaches have real, fair pros and cons, and the right answer depends a lot on the tub itself. Here is the honest version, with both sides laid out, and then where we land.
The thing nobody tells you: salt water still uses chlorine
A "salt water" hot tub is not chlorine-free. It still sanitizes with chlorine. The difference is where the chlorine comes from. Instead of adding it by hand, a salt cell generates chlorine from salt through electrolysis, automatically and continuously, as water passes through it. So a salt system is really a different way of producing the same sanitizer, not a different sanitizer.
That single fact reframes the whole comparison. The question is not "chlorine or no chlorine." It is "do I want chlorine added by hand in small amounts, or generated automatically by a salt cell," and each path comes with its own tradeoffs.
The case for salt
Salt systems are popular for good reasons, and it is worth giving them fairly:
- Softer-feeling water. Many people describe salt-generated water as silkier on the skin.
- Less chemical handling. Because the cell makes chlorine on its own, you are measuring and pouring less often.
- Gentler on sensitive skin. Some users with sensitive skin find a salt system more comfortable.
- Less odor. Salt water tends to have a milder chemical smell than a tub dosed by hand.
If the appeal of a hot tub for you is partly about how the water feels and partly about touching chemicals as little as possible, those are genuine benefits, and they are why salt has a loyal following.
The case against salt
The tradeoffs are just as real, and they are mostly about what salt does to the equipment over time:
- Salt is corrosive. Over time it is hard on metal parts, jets, heaters, fittings, and seals, and it can shorten the life of that equipment.
- The cell wears out. A salt cell is a consumable. It typically needs replacing every 3 to 5 years, usually in the range of a few hundred dollars (commonly around a few hundred dollars).
- Higher upfront cost. A salt system usually adds to the purchase, often on the order of about a thousand dollars more.
- It struggles in the cold. Salt cells make chlorine less effectively in cold water, which matters in a Prairie winter when the tub needs sanitizing most.
Salt buys you softer-feeling water and less hands-on chemical handling. It costs you a corrosive environment for the metal parts, a cell that wears out and needs replacing, a higher upfront price, and weaker performance in cold water. Neither column is wrong. It is a tradeoff, and it is worth seeing both halves before deciding.
Standard chlorine, done well
The traditional approach is to add chlorine by hand, and it gets a bad reputation it does not fully deserve. The "smell and sting" people remember usually comes from a tub with weak filtration and an unbalanced chemistry, not from chlorine itself. On a well-built tub with strong filtration, the amount of chlorine you handle is small and the routine is quick.
This is the part that matters most, and it gets skipped: how much chlorine you have to deal with depends heavily on the tub. A shell that resists bacteria and a filtration system that does real work mean the sanitizer has less to fight, so you use less of it and handle it less often. The sanitizer method is only half the picture. The tub is the other half.
Where an Eco Spa lands
An Eco Spa runs on standard chlorine, and the reason is straightforward once you look at how little of it the tub actually needs. The build does a lot of the work that a salt system is often brought in to solve.
- A non-porous HDPE shell. The one-piece HDPE unibody is non-porous, so bacteria has nothing to grip and grow into, unlike a more porous surface.
- 100 ft of filtration. Every model carries 100 ft of filtration across two large filters, which keeps the water clean mechanically before chemistry even comes into it.
- An optional ozone upgrade. The Ecozone ozone system is an optional paid upgrade that cuts chemical use further for owners who want to lean on chlorine even less.
Add those up and the routine is light. An Eco Spa typically needs only about a tablespoon of chlorine every one to two weeks, with maintenance on the order of a few minutes a month on the largest model. That changes the salt math. A salt system is largely a way to reduce chlorine handling and soften the water, and a corrosive cell is a meaningful cost to take on for that. When the tub already needs very little chlorine to begin with, a salt system is solving a problem you do not really have, while adding corrosion, a replaceable cell, and upfront cost on top.
Side by side
| What to compare | Salt water system | Eco Spa (standard chlorine) |
|---|---|---|
| Sanitizer | Chlorine, generated from salt by a cell | Chlorine, added by hand in small amounts |
| Water feel | Often described as softer | Clean and balanced; filtration does the work |
| Chemical handling | Less hands-on, cell makes it | ~a tablespoon every 1 to 2 weeks |
| Equipment life | Salt is corrosive to metal parts | No corrosive salt in the water |
| Consumables | Cell replaced every 3 to 5 years | Chlorine and filters; non-porous shell |
| Cold-water performance | Cell makes chlorine less well when cold | Not dependent on water temperature |
| Upfront cost | Usually higher (often roughly a thousand dollars more) | No salt-system add-on; ozone optional |
If you love the feel of salt water and you have weighed the corrosion, the cell replacements, and the cold-water tradeoff with eyes open, a salt system is a reasonable choice and plenty of people are happy with one. Our position is just that on a tub built to need very little chlorine in the first place, the simpler chlorine routine gives you most of the upside with none of the corrosion, and that is the path we build for.