What's The Deal With Salt Water Hot Tubs? | St. Cyr’s Pool & Spa

What’s The Deal With Salt Water Hot Tubs?

For a few years now, salt has been all the rage in the swimming pool and spa world. If you are looking to install a new pool or buy a hot tub you have probably heard of, and are wanting a salt water option.

But what does this mean? How does salt work? And is salt really the best option for keeping your water clean and clear?

The Big Salt Myth…

In my nearly 20 years in this industry I have yet to see any product in such high demand yet so wildly mis-understood.

With that said I want to get the biggest misconception about salt water hot tubs out of the way as quickly as possible….when you ask for a salt water pool or spa you ARE asking for a chlorine pool or spa.

That’s because what these systems are actually called is Salt Water CHLORINE generators . You see, salt systems use salt to make chlorine. The salt is NOT what is doing the sanitation.

I think this is an important distinction because most customers who ask for salt are looking for a chemical free, natural water care system, and that is not way a salt water hot tub is.

Now if you have read this far this article is really starting to sound like a hit piece on salt water systems, so I should state I actually think salt chlorine generators do a pretty good job of sanitizing water. The key thing to understand is that it is no different than having a slow drip feed of bleach being pumped into your hot tub.

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And just so you know I am not biased, I have sold salt water chlorine generators to hundreds of customers in Massachusetts and New Hampshire.

The problem is the marketing for salt water pools and hot tubs has been very misleading over the years, so I always give my customers this same pitch about salt systems and let them choose what is right for them. For some people, salt is not the right solution for sanitizing their hot tub water.

In fact if you are looking for a low chlorine hot tub, salt is NOT the right option. There are other systems out there that have been around for a lot longer than salt generators that actually use LESS chlorine than salt water models.

Systems like ozone generators, UV light, and mineral systems which have been around for decades offer clean water solutions that are very low chlorine and low maintenance.

How Do Salt Water Hot Tubs Actually Work?

So now that we know salt water spas just use salt to create chlorine we should know how they actually do that.

how do salt water hot tubs work?

The chemical compound for salt is NaCl known as Sodium Chloride. The basic idea is if we can seperate the Sodium from the Chloride we can produce chlorine. That chlorine then mixes with the water just like it would if you poured in liquid bleach (also known as Sodium Hypochloride) into the hot tub. That chlorine will create a residual level in the water which can be used to sanitize and oxidize harmful contaminants.

So how does a salt chlorine generator separate the chloride from the sodium?

It uses a process called electrolysis.

Lets see the Wikipedia Explanation:

Salt water chlorination is a process that uses dissolved salt (2,500–6,000 ppm) as a store for the chlorination system.[1] The chlorine generator (also known as salt cell, salt generator, salt chlorinator or SWG) uses electrolysis in the presence of dissolved salt (NaCl) to produce chlorine gas (Cl2) or its dissolved forms -hypochlorous acid (HClO) / sodium hypochlorite (NaClO)- which is the sanitizing agent already commonly used in swimming pools. Hydrogen is produced as byproduct too. As such, a saltwater pool is not actually chlorine-free; it simply utilizes added salt and a chlorine generator instead of direct addition of chlorine.

In chemistry and manufacturing, electrolysis is a technique that uses a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction.

Basically it zaps the salt with electricity which causes the sodium and chloride molecules to separate.

Are Salt Water Hot Tubs Maintenance Free?

Umm….no.

Unfortunately there is no system on earth that will eliminate routine maintenance of pool or spa water.  The good news is whether you have a salt water hot tub or use any other kind of sanitation system, you shouldn’t spend anymore than 5 minutes a week maintaining your hot tub water.

The only thing that is different in a salt water chlorine generator hot tub (see what I did there <<<)  from a standard chlorine hot tub, is you do not add your chlorine manually.

All the other water balance chemicals are the same , you still have to test and adjust; PH, Alkalinity, and Calcium hardness.

Are salt water hot tubs maintenance free?

And truth be told, with the sensitivity of the expensive electrolydic cells used in the chlorine generators, water balance is even more important in a salt water hot tub.

Again water care in a hot tub is fairly simple once you get into a routine, and your local dealer where you buy your hot tub will be there to help you every step of the way. So none of the above should scare you away from enjoying the amazing benefits of hot water hydrotherapy.

There is some other maintenance involved in a salt water hot tub as well. You do have to clean the cells periodically and or change the cells periodically, and those cells are not cheap. You can spend hundreds of dollars a year on salt cells.

What are some low chlorine alternatives to salt water hot tubs?

There are 3 systems that can be found in many top hot tubs manufactured and sold in the US that have been used for years. I mentioned them earlier in the article.

Ozone Generators– Uses oxygen to create O3 gas, O3 is a strong oxidizer that will kill any bacteria or contaminates it comes in contact with, then it turns back into Oxygen – talk about natural!

UV Sanitation – UV rays are great at disinfection. UV actually scrambles the DNA of micro-organisims which prevents them from replicating and spreading to bathers in the water.

Mineral Sanitation – minerals like silver and zinc  have been used since the days of the Roman Empire to sanitize bathing water.  The minerals wipe out contaminants on contact.

All of these systems reduce the demand of chlorine in your hot tub, combine them and you have a virtually chlorine free sanitation system.

The spas we sell at St. Cyr’s Pool & Spa in Middleton MA use both ozone and mineral sanitation to reduce chlorine levels.  With a salt water hot tub your chlorine levels will be between 3 and 5 parts per million. With an ozone and mineral system your chlorine levels can be between ,5 and 1.5 parts per million! That is a drastic reduction in the amount of chlorine you are bathing in.

Should You Buy a Salt Water Hot Tub?

Salt water chlorine generators do a great job of producing a consistent level of chlorine into your hot tub over time and it can be a great system. Just realize there are plenty of other ways to easily add chlorine into your hot tub and keep it clean and clear with ease.

Just like ozone, UV, Mineral, Peroxide, and other sanitation options, salt is just one way to do it. The important thing when choosing a hot tub is finding one that fits your family, your body and your lifestyle. Then the MOST important thing to consider is buying from a local dealer you can trust to support you for the life of your spa.

Hopefully this article has been informative and has given you a good background of what a salt water hot tub actually is, what it isn’t, and how it works.

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