The 5 Best Chemical Free Hot Tub Sanitizers in 2022

By htforyou | Blog

Jan 10
chemical free hot tub

Sanitizing your hot tub will usually require the use of chemicals such as bromine and chlorine. But as you know, exposure to chemicals isn’t good. So, to ensure your safety, it’s best to use a chemical free hot tub sanitizer.

Using chemicals in cleaning your pool might be acceptable, but it’s a different story when it comes to your hot tub. A hot tub isn’t a swimming pool and is used mainly for bathing. Sometimes, you even use it for your kids, so using chemicals in cleaning it is definitely unacceptable.

But don’t worry because there are chemical-free cleaning options that you can use to sanitize your hot tub. Below, we’ve rounded up the best hot tub sanitizers for both regular and inflatable hot tubs that don’t have any chemicals in them.

#1 – Leisure Time 45510A Control, Quart

If you’re looking for a hot tub sanitizer for sensitive skin, this Leisure Time hot tub sanitizer is what we would recommend. This is a biguanide-based sanitizer that’s free from bromine and chlorine.

Thus, it doesn’t produce any of those toxic smells that come with using chemical-based sanitizers. Furthermore, this sanitizing system can also help to keep the water in your tub clear and clean. In addition, this product is made with a special formula that prevents stains and that unappealing waterline film that tends to develop around the tub.

Since the Leisure Time is gentle on your skin, it’s the best sanitizer for spa owners who are looking for a safer alternative to chemical-based sanitizers. In fact, Leisure Time has a full range of spa sanitizing solutions that cater to spa owners.

This non-chlorine sanitizer is also formulated to break down lotions, oils, and other substances. You can also use it as part of Leisure Time’s Simple Spa Care Program in order to help improve filtration in your tub while also keeping the water clean.


  • Comes with a sequestering agent
  • Formulated to prevent the development of ring around the surface of the tub
  • Minimizes metallic stains
  • Minimizes the buildup of waterline on your tub
  • Prevents the development of waterline residue


  • Tends to produce waterline scum
Leisure Time 45510 Control Spa and Hot Tub Care, 1 qt
  • BENEFITS: Formulated to prevent the ring around the spa surface caused by oils, organics, minerals, and scale
  • USE: Apply at start up and weekly thereafter; Add this product before adding Boost or Free
  • COMPATIBILITY: Works with Leisure Time Simple Spa Care specialty line of products and specifically designed to work in the Free biguanide system with Boost Free
  • FEATURES: Prevents waterline residue and controls metallic stains and scale; Contains sequestering agent; Removes stain and scale
  • INCLUDES: One 1-qt bottle of Leisure Time Control

#2 – Hot Spring Freshwater Spas MPS Chlorine-Free Oxidizer

If you need a chemical free hot tub sanitizer that will also keep the water in the tub sparkling clean, the Hot Spring Freshwater Spas MPS Chlorine-Free Oxidizer is definitely worth checking out! This product will keep the water in your tub clean, clear, and odor-free.

The Hop Spring freshwater chlorine-free sanitizer is also ideal for spas. It can effectively minimize the toxic odor coming from the chloramines, ammonia, lotion, oils, soaps, and other substances.

Hot Spring also carries a full line of spa fragrances, control systems, air and water valves, filter accessories, pumps, cleaners, thermostats etc.


  • Non-chlorine sanitizer
  • Keeps your hot tub water sparkling clear
  • Removes the odor coming from lotions, oils, ammonia, and chloramines


  • Overpriced

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#3 – SpaGuard Enhanced Shock

Another great sanitizing product that spa owners should have is the SpaGuard Enhanced Shock. This is a powerful and effective hot tub sanitizing treatment that eliminates the buildup of contaminants in the tub. What’s great about this product is that it will only take 15 minutes to make it work.

When used, the oxidizers will work by breaking down and removing the compounds that trigger the development of odors. It also comes with a clarifier that helps the filtering system detect and remove particles.

The SpaGuard Enhanced Shock is well compatible with bromine, chlorine, ozone, as well as ionization sanitizing systems. It is pH buffered to prevent changes in the pH balance on your tub.


  • Can help keep the water in your tub sparkling
  • Works with a chlorinated or brominated hot tub or spa
  • Multi-purpose chlorinated shock
  • Shock and soak in only 15 minutes


  • Labeling instructions are confusing
SpaGuard Enhanced Shock (2 lb)
  • SpaGuard Enhanced Shock 2lb

#4 – Pool & Spa Anti Foam Defoamer Concentrate

Another great option for an eco friendly hot tub sanitizer is this Pool & Spa Anti Foam Defoamer Concentrate. This water-based sanitizer effectively removes foam in tubs, pools, spas, and even decorative fountains. What’s great about this product is that it will not mess up the water’s overall chemistry.

After applying this sanitizer on the tub, you won’t feel any of those nasty residues at all! Simply pour 1-2 ounce of this sanitizer in a 10,000-gallon of water and that should be enough to remove the foam.


  • The sanitizer can be used in pools, tubs, spas, fountains, etc
  • It will immediately disappear after applying in the water
  • Won’t alter the waters chemistry


  • The foam goes back when you stop using the product
Pool & Spa Anti Foam Defoamer Concentrate - 1 Gallon
  • WATER BASED silicone formula which DOES NOT disturb the water chemistry. DOES NOT leave an oily residue or cloud the water.
  • SUPER CONCENTRATED Defoamer. COMPATIBLE with All types of water chemistry including Chlorine, Salt Water & More.
  • PROUDLY MADE IN THE USA. Don't take chances adding potentially dangerous chemicals into the water that your family swims in.
  • 30 DAY HASSLE FREE MONEY BACK GUARANTEE – We value our customers and we stand behind ALL of our products 100% with no questions asked! If you are not pleased simply call or email us with your order number and we will reimburse you in FULL!

#5 – Hot Tub Serum Conditioner and Clarifier

The Hot Tub Serum Conditioner might come in a small package but don’t ever be fooled by its small size.

This product is effective at keeping your tub sanitized for up to 6 months! After you complete the initial cleansing of your tub, simply refill your tub and add a small amount of this serum.

But the best thing about this product is that it doesn’t come with all those nasty chemicals. So, if you’re looking for non-chlorine hot tub options, this product is worth checking out.

It will only take a small amount of this serum to keep your tub clean and safe to use. This serum will leave your tub feeling clean and smelling great.


  • Keep the bio-matter from accumulating in the pipes
  • Keeps the plumbing of your tub clean
  • A small dose of the serum each week will go a long way in keeping your tub clean
  • The water feels silky and soft


  • Pricey
Hot Tub Serum - an EPA Registered Weekly Maintenance Bio-Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses)
  • Your Hot Tub is part of your family. It deserves to be chemically pampered. The serum is the only weekly maintenance product you will see in this category that has the highly regarded EPA Registration that is NOT designated as a sanitizer/oxidizer.
  • Compare Serum to many other brands that you see as a maintenance product. Hot Tub Serum performs a Powerful Clean Performance. It polishes water to super brilliance reduces sanitizer decay rates for extra sanitizer mileage softens water for the ultimate soaking escape and mitigates organic plumbing & jet bio-contamination.
  • Serum maintenance is added at a weekly rate of one ounce per 100 gallons. The serum will work with chlorine, bromine, ozone, mineral sticks, enzymes, or any other chemical protocols you now use
  • This Hot Tub Serum will help protect all your hot tub components and increases filtration efficiency. The product is the time-tested weekly maintenance that will save you money over the years and pamper you with the benefits of hot water therapy.
  • Cut down on costly repairs and replacements with properly cleansed pipes jets and heater.

Why Use Chemical Free Hot Tub Sanitizers?

We all know that chemicals are bad for our health and the environment as well. While they might be really effective in keeping our bathtub cleaned and sanitized, the risks that come with using them are not really worth it.

Here are some reasons why you should switch to eco-friendly hot tub sanitizers.

#1 – No Eye Irritation

Chemical sanitizers could leave your eyes feeling irritated. So, don’t be surprised to find yourself scratching your eyes as you soak in the tub. Constant exposure to these toxic chemicals might actually cause damage to your eyes, so it’s time to stop using chemicals in your tub.

#2 – No Chemical Smell

If you’ve been using chemical-based sanitizers in cleaning your toilet or tub, then you’re probably familiar with that nasty smell that these chemicals give off. The strong smell can be toxic and could affect your bathing experience.

#3 – No Bleach Effect

Do you know that soaking your hair in chlorine for a long time can cause its color to change? You could suffer from the same effect if you constantly soak in your tub that’s been exposed to chlorine. And if your robe and other clothing will be exposed to these chemicals, it could develop a nasty color!

#4 – No Effect on Sensitive Skin

Although not all people are sensitive to chemicals, there are those who have very sensitive skin and could develop allergies when their skin gets exposed to chemicals. Also, regular bathing in a tub that has chemicals could damage your skin in the long run.

Types of Hot Tub Sanitizers

There are different types of hot tub sanitizers that you’ll find in the market now.

Here are the most popular among them:


Chlorine is the most popular product used in sanitizing toilets and hot tubs. It is sometimes used along with mineral sanitizers to prevent cloudy water. But chlorine is not good to use on its own and you will not find it in tablet form.


Mineral sanitizers use copper or silver ions in sanitizing the water in your tub. But unlike the chemical sanitizers, these mineral sanitizers are eco-friendly. They also don’t produce nasty odor and have almost no side effects, unlike bromide and chlorine.


Bromide is another popular chemical used in cleaning hot tubs. This chemical ensures the continuous sanitation of your tub. It is usually inserted in a bromide feeder that floats in the tub and it comes in the form of tablets. Unfortunately, many users complain of irritated skin when using this chemical as a hot tub sanitizer.

Top Sanitizer Alternatives

We understand that the reason why you’re here is to look for chemical-free alternatives to hot tub sanitizers. So, we’ll let you in at some of the best hot tub chemical alternatives.

These alternatives can minimize your exposure to chlorine and other chemicals when sanitizing your tub.


In case you’re not aware, the sun is actually capable of killing bacteria. Thus, using ultraviolet systems is one way to sanitize your tub and get rid of all the harmful bacteria lurking in your tub.

With this system, the water will be passing into a tube that has some UV bulbs attached. The radiation from these bulbs will kill the bacteria present in the water that will cross its path, making it truly effective in sanitizing your hot tub.

But take note that the UV system will only free your tub from contaminants. It won’t clear the water in your tub so you may still have to use bromine or chlorine, but only in minimal amounts.


Ozonators work by injecting ozone to the water in your tub. Just like the Earth’s ozone layers, the ozone works to protect your tub from harmful bacteria. In fact, ozonators are said to be 3,000 times more effective compared to chlorine and bromine, which makes them a great alternative to chemical-based hot tub sanitizers.

Ozonators come in different sizes and shapes, and you can choose something according to the size of your tub. There are also ozonators that can be used for pools. But the downside of using ozonators is that it can get very expensive.


Ionizers will release silver and copper ions to water. The ions are powerful enough to kill all the algae and bacteria in the water in your tub.

Yet, it will not cause harm to humans no matter how long you will be soaking in it. Using the ionizer can also help balance out the acidity in water and you’ll have to change it regularly since the ions are getting depleted.


Technically called the polyhexamethylene biguanide, the biguanides are known for being gentle on the skin and eyes. So, if you’re looking for a hot tub sanitizer for sensitive skin, this product is highly recommended.

In fact, some of the contact lens solutions are made from this chemical. The drawback is that you’ll still need to use a non-bromine or non-chlorine based to shock it.

How to Balance Hot Tub Sanitizer Levels

Here are some tips to keep in mind when balancing the level of sanitizer in your tub.

  • The strip that’s used to measure the water’s alkalinity and the pH level can also be used to check the level of sanitizer.
  • Given the wide range of sanitizers in the market, it is best to experiment by trying a few of them and then identifying which of these sanitizers will work best for you.
  • If you want to use chlorine or bromine-based sanitizers, it is best to use them in the form of granules.
  • Choose a type of sanitizer that’s easy for you to maintain even in the long run. Besides, sanitizing your hot tub is not only a one-day task.
  • Make sure you adhere to the specified gallons of water to use with your sanitizer. Refer to the instruction manual that comes with the sanitizer you’re buying to ensure excellent results.

Final Thoughts

As you can see, there are plenty of non-chlorine hot tub options in the market. But you might be wondering which among these products listed above you should go for. The Leisure Time 45510A Control is the product that we would highly recommend.

This biguanide-base sanitizer is perfect for those with sensitive skin and eyes. Plus, it’s truly effective in keeping your tub sanitized and cleaned.

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