Best Chemical Free Hot Tubs – UPDATED 2020 – A Complete Guide!

More and more hot tub owners are looking for options to run their tubs without using chemicals. There can be many reasons to go chemical-free. A chemical-free spa experience not only reduces the imprint on the environment but also suits health concerns like sensitive skin and allergies.

There are alternatives that can reduce the use of chemicals to a great extent. However, some of the options are expensive and impractical. Today, we discuss some of the ways to ease your concern about germs and chemicals in the hot tub. Let us look at the best options available to keep your hot tub clean, healthy and safe.

Best Chemical Free Hot Tubs – UPDATED 2020

Bestseller No. 1
Bestseller No. 2
Hot Tub Things Oxidizing Spa Shock 2.2 Pounds - Prevents Organic Buildup and Cloudy Water
Use shock weekly to control and prevent organic buildup that causes cloudy water!; America's #1 Trusted Brand of Hot Tub Chemicals
Bestseller No. 3
Natural Spa Hot Tub Start-Up Kit – Non-Toxic - Chlorine Free - Bromine Free - No More Hot Tub Chemical Rashes & Hot Tub Chemical Fumes | Includes Natural Hot Tub Cleaner | 6 Month Supply of Treatment
Non-Toxic Hot Tub Water Treatment.; Kit treats hot tub water for up to 6 months.; Stabilizes pH & alkalinity. Virtually eliminates the need to balance water in most cases.
Bestseller No. 4
Clorox Spa 50016CSP Antifoam, 16-Ounce
Prevents And Eliminates Foam; No Assembly Required; Country Of Origin: United States
Bestseller No. 5
SpaGuard Enhanced Shock (2 lb)
SpaGuard Enhanced Shock 2lb

Last update on 2020-10-19 / Affiliate links / Images from Amazon Product Advertising API

There are numerous chemical free hot tub systems available in the market for those who want a natural spa treatment.

These solutions are aimed at reducing the amount of chlorine and other chemicals needed to maintain the tub.

Hot Tub Chemical Alternatives – What You Should Know?

When you use hot tub chemical alternatives, you should follow some practices to reduce the use of chemicals in your spa. Here are some important tips.

Shower before use

A great way to reduce the use of chemicals in the hot tub is to limit the amount of bacteria, oils and cosmetic products entering the hot tub water.

Bathers can take a shower before entering the spa. If they use any hair product, they should wash the hair as well. This will ensure that a reduced amount of sanitizer is required.

Drain frequently

While a general practice is to drain the hot tub every 3-4 months, a non-chemical hot tub should be drained every 2-3 months.

Following a strict spa maintenance routine by cleaning and draining more frequently would lower the amount of chemicals required.

Keep the hot tub balanced

A chemical-free hot tub should be maintained to keep the hardness, pH and alkalinity levels within the recommended ranges. Disturbed levels can often reduce the effectiveness of sanitizers.

Keep the tub covered

A hot tub cover is important to maintain a chemical-free hot tub water. A cover can keep insects, debris and other contaminants from entering the water. This means your sanitizer will last longer and the use of chemicals would decrease.

Non-Chlorine Hot Tub Options

Ultraviolet (UV) System

One of the best alternatives to a chemical hot tub, UV system uses radiation to sanitize the spa. UV light is installed in a pipe of the circulation system in the tub and it kills the bacteria in the passing water with ultraviolet rays.

This system is exactly the same as used in municipal water treatment facilities and in rural areas to make well water drinkable. Though UV systems get you rid of contaminants, you may need to use a shock to improve the clarity of water.

Salt-Water Sanitizers

Salt-based sanitizer systems can make the hot tub chemical-free by limiting the use of chlorine and bromine. Salt kills bacteria with a natural chemical reaction known as electrolysis. Adding salt to the hot tub water results in the production of chlorine gas.

This natural gas effectively kills the bacteria in your spa without having to deal with the irritation of the chlorine chemical. Moreover, salt water sanitizers lower the maintenance frequency of hot tubs and provide healthy water.


Another great chemical free hot tub option is the use of ionizers. Hot tub ionizers use various metallic ions to kill bacteria and algae in the water. This use of ions has been known since earlier times.

Humans have always been using metals like copper and silver for purification. Ionizers do offer a natural hot tub treatment but should be supplemented by chlorine or bromine. However, ionizers allow hot tub owners to reduce their use of chemicals to a great extent.


A lot of people prefer using this system for running hot tubs without chemicals. Ozonators work by injecting ozone into the water. They work as natural sanitizers and powerful oxidizing agents. Ozone can kill all the bacteria and other organisms in the tub quickly and effectively.

You can either use corona discharge (CD) ozonators or Ultraviolet light (UV) ozonators. While they still need some sanitizer, they reduce the use of chemicals to a great extent. They can also lower the frequency of shocking the hot tub.

Non-Chlorine Shock

A non-chlorine shock is not essentially a sanitizer like a chlorine or bromine shock. So you don’t get a non-chlorine hot tub. However, this type of shock works efficiently to eliminate contaminants, oxidize water and improve the clarity of the water.

Moreover, it can improve the function of chlorine in the hot tub. If your hot tub uses a chlorine sanitizer, this type of shock would create a lot of free chlorine in the system. If you are using a bromine hot tub, it would activate bromine.

Enzyme-Based Treatment

An excellent solution for a natural spa treatment, enzyme-based sanitization reduces the use of chemicals to a great extent.

They don’t eliminate the requirement of shock and sanitizer but make it easy balancing the water. This type of system works by breaking down inorganic elements like oils, greases, lotions and sweat to free chlorine and handle only the organics.

Hot Tub Sanitizer For Sensitive Skin – What Are Your Options?

Those who have a sensitive skin might find it difficult to use a spa as their skin can easily get irritated by the harsh hot tub chemicals. However, there are various natural alternatives for hot tub sanitizers to suit sensitive skin. While it is not possible to have a completely chemical-free hot tub, the solution is to minimize the use of chemicals and use the safest chemicals for skin.

To get a natural hot tub sanitizer for sensitive skin that does not use much chlorine or bromine, there are various options like ionizers, ozonators, saltwater and UV systems. However, each of these solutions has its own advantages and limitations.

The most common causes of skin irritation are chlorine and bromine so the key is to avoid using these chemicals and take extra measures like draining the tub more often and changing filters on time.

One of the best options for sensitive skin is biguanides, a chlorine and bromine free sanitizer. They have antimicrobial properties and are gentle on skin.

They also don’t create the chloramines generally associated with chlorine and bromine spas. This makes your hot tub healthier and provides a pleasant spa experience.

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