What Can I Use Instead of Chlorine In My Spa Pool?







Chlorine-free sanitisers are regarded by some to be a more natural sanitising alternative. This article explains which chlorine-free spa chemical systems are the best, how they work, and why you should consider making the switch. 

These unexpected natural alternatives are great for bathers with sensitive skin or respiratory issues.

What is the Best Chlorine Free Spa Chemical System?


Non-chlorine spa treatments leave your skin feeling softer, without sapping the moisture out in the way that chlorine does. You also don’t have to worry about long-term exposure to harmful fumes and the absorption of harmful carcinogenic chemicals into your skin and respiratory system.

Now, with so many options to choose from it’s enough to make your head spin, however, there are two main products we'll consider in this article - hydrogen peroxide spa sanitizer, and mineral ion systems, like Nature 2 Spa Sticks.

Sanitising systems like these can effectively sanitize spa water, keeping you safe from potentially harmful bacteria, with no negative side effects.

Benefits of Hydrogen Peroxide in a Spa Pool

Along with being safe for those with sensitive skin and respiratory issues, there are many benefits to switching out your chlorine chemical system for hydrogen peroxide spa sanitizer.


Spa Store Chlorine-Free Hydrogen Peroxide Sanitiser  Poppits® Chlorine-Free Hydrogen Peroxide Sanitiser

A Powerful Oxidizer

Hydrogen peroxide is a far more powerful oxidizer than chlorine, helping it break down unwanted components within your water, such as oils, lotions, dead skin cells, sweat, and any other organic matter that accidentally ends up in your spa pool.

No Adverse Reactions With Other Chemicals

Hydrogen peroxide spa sanitizer is safe to use in your spa pool for the first time even if there is already chlorine and other sanitizing agents in the water. Unlike some other chemicals, you can use hydrogen peroxide in already treated water or in a clean tub without any adverse reactions.

Better Water Oxygenation

Although hydrogen peroxide is still a chemical, once it is added to water it breaks down into water and oxygen thanks to its chemical composition of H2O2. Studies have shown that once added to water, hydrogen peroxide breaks down instantly, increasing the oxygen levels of the water.

No Harmful Fumes

At high concentrations, hydrogen peroxide must still be handled with care, however, once added to the spa pool in the correct amounts there is no risk of inhaling harmful chemicals or foul-smelling fumes. 

Doesn’t Wick Moisture, Leaving Skin Soft

Unlike chlorine, which can leave skin feeling dry and parched after soaking in the spa tub, hydrogen peroxide leaves the skin feeling smooth and soft due to its composition and effect on the water hardness.

Disadvantages of Hydrogen Peroxide

With its many benefits, there are concerns worth noting before deciding to choose hydrogen peroxide as your go-to non-chlorine spa chemical system.

Toxic and Corrosive When Undiluted

The hydrogen peroxide used for spa pools comes in a concentration of between 15%-19%. This is a big difference from the 3% concentrations found in grocery stores. At this high concentration, hydrogen peroxide is corrosive and toxic. It is vital to keep it properly labeled and out of reach from children.


The chemical must be stored in a cool, dark place, as hydrogen peroxide becomes more active with heat and sunlight. When handled, protective gear must be worn to avoid chemical burns on the skin and eyes. This chemical must be handled with care and knowledge for it to be deemed safe. 

Does Hydrogen Peroxide Lower Chlorine in a Spa Pool?

No, Hydrogen Peroxide is an alternative to Chlorine, and you will need to use a product like the Poppits Quick Fix Chlorine-Free Spa Shock to lower the chlorine level in your spa pool, before transitioning to a chlorine-free system.



Read our detailed guide on how to switch to the Poppits Chlorine-Free system.



Does Nature 2 Really Work?

The Nature 2 Spa stick is a safer, yet equally as effective, non-chlorine spa treatment in comparison to traditional spa sanitization chemicals. It works by automatically dissolving trace minerals such as silver and copper into your spa water to effectively sanitize the water by eliminating bacteria and viral cells.


Nature2 Spa Stick Natural Spa Pool Purifier


Unlike many other chemical methods of sanitization, using Nature 2 Spa sticks can eliminate skin problems and eye irritation commonly associated with harsh spa pool chemicals like chlorine and bromine.

How Do You Use The Nature 2 Spa Stick?

In order for the Nature 2 Spa Stick to work how it is designed to, it is important to follow the correct procedure for setup. Setting up the Nature 2 Spa stick is simple and doesn’t require any safety procedures. Here are the recommended steps to using a Nature 2 Spa Stick:


  • Drain your spa completely, especially if it hasn’t been used in a while, or if the spa water contained any bromine or biguanide beforehand.

  • Clean any algae or debris out of the spa, including the plumbing if necessary.

  • Replace or clean your filter if necessary to get a good fresh start.

  • Refill your spa using the cleanest water possible. (You can also add a pre-filter to the output if necessary.)

  • Balance your water to alkalinity between 80-120ppm, and a pH of 7.2-7.8ppm.

  • Make sure your filter is at least 7”(18cm) and insert the Nature 2 Spa stick into the filter, leaving a 1”(2.5cm) space above the bottom of the filter to avoid restricting the water flow. 

  • Finish off the process by shocking the water with 1.5 tablespoons of Di-Chlor per 250 gallons (1100 liters).

  • Run the spa for 4 hours minimum.

  • Only enter the spa if the free available chlorine is below 5ppm.

Frequently Asked Questions

Hydrogen peroxide test strips for spa pools and hot tubs

As a general rule, it is important to always test your spa pool water using hydrogen peroxide test strips if you are using hydrogen peroxide spa sanitizer to sanitize your spa pool. Exposing your skin to unsafe levels of hydrogen peroxide could cause irritation, and not using enough can prove ineffective at oxidation and sanitization of your pool. The recommended levels of hydrogen peroxide in pool systems are 50-90ppm.

Hydrogen peroxide vs bromine vs chlorine

As a whole, bromine is a commonly used chemical treatment for the sanitization of spa pools, however, hydrogen peroxide is making headlines as an excellent alternative to bromine and chlorine. To decide which one is better, there are many factors to consider including cost, overall harm, and effectiveness.

The truth lies with those experiencing negative side effects, such as allergic reactions, skin irritation, and respiratory problems after using bromine or chlorine to treat their spa pools. This is where hydrogen peroxide is often a great choice for individuals with these issues. When used correctly in spa pools, hydrogen peroxide has no harmful side effects and safely dissipates into water and oxygen.

Is hydrogen peroxide better than chlorine?

Overall, hydrogen peroxide is a far better, more environmentally friendly alternative to bleach when it comes to a multitude of uses, including in spa pool water. Chlorine is linked to a variety of health risks, including certain types of cancer, skin rashes and irritation, and respiratory damage.

On the other hand, hydrogen peroxide in the correct dilution is safe enough to use for the treatment of many infections, topical treatment of wounds, and even gargled as an effective mouth wash. When it comes to the oxidation and sanitization of spa pools, hydrogen peroxide is a far better oxidizer than chlorine. Chlorine is a better sanitizer, but without proper oxidization, sanitization is less effective. 

What can I use instead of chlorine in my spa?

There are many non-chlorine spa treatment alternatives to chlorine for treating and sanitizing spa pools. Some of the most popular alternatives include hydrogen peroxide, Nature 2 Spa Sticks, other mineral systems, and Bromine. Bromine is the closest in relation to chlorine, while hydrogen peroxide and mineral systems, such as the Nature 2 Spa sticks, are considered as more 'natural'.

Do spas need chlorine?

In total, you do not definitely need to use chlorine to sanitize and oxidize your spa pool. There are many alternatives, some may even prove healthier and more cost-effective in the long term. 

Some cost-effective, more natural non-chlorine spa treatments include hydrogen peroxide and mineral systems such as the Nature 2 Spa sticks. These treatment options can work just as well as chlorine can while saving your skin from irritation and causing less harm to the environment. 

Does non-chlorine shock kill bacteria?

Yes, non-chlorine shock does kill bacteria, especially the basic varieties of bacteria found in spa pools. However, for some stronger varieties such as pathogenic bacteria, non-chlorine shock may not be as effective as chlorine shock treatments, which can kill 100% of pathogenic bacteria.


Non-chlorine shock is better used as a weekly treatment to oxidize water, removing contaminants, and clearing a cloudy appearance. Used in combination with chlorine shock treatments, non-chlorine shock creates better availability of free chlorine, the type of chlorine needed to neutralize bacteria effectively.