How to Lower Combined Chlorine in a Hot Tub? – Follow These 4 Easy Methods


how to lower combined chlorine in a hot tub

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According to the research data published by PWTAG, your hot tub should have zero amount of combined chlorine, or at least half the amount of free chlorine present in your tub.

However, maintaining this balance can be difficult and you may have excess combined chlorine in your tub.

Now, this can cause multiple issues not just to your hot tub but to your health too.

But, you don’t have to worry about that now onwards.

Reducing combined chlorine level of your hot tub is not as hard as you think.

In this article, I have mentioned 4 most efficient methods that will help you reduce the combined chlorine in your hot tub quite easily.

Those four methods are super chlorination, non chlorine shocking, usage of enzymes, and using supplemental sanitation.

The first method which I will explain in detail in the next section is super chlorination.

In this process, you basically dump excessive free chlorine into your hot tub to reduce the level of combined chlorine in the tub.

Not only this process fixes the issue of excessive combined chlorine in your tub but also treats other contaminants that might be lurking in your hot tub water.

Let’s take a detailed look at the process of super chlorination in the next section of this article.

After that, I will also explain 3 other methods for reducing the amount of combined chlorine in your spa.

If you want to understand all the methods properly, then kindly read this article till the end.

4 Super Easy Methods to Reduce Combined Chlorine in a Hot Tub

As I have already mentioned earlier, we will go through multiple methods of lowering down the combined chlorine level of your hot tub in this section.

All these methods are quite easy to do and have been effective for most of the tub owners out there.

Let’s see all of them one by one now.

Method 1: Super Chlorination Process

Like I said in the first section, super chlorination is considered one of the best ways for reducing combined chlorine in your hot tub. 

In this process, you add an excessive amount of free chlorine in your tub.

The amount of free chlorine is approximately, 10x the amount of combined chlorine in your tub.

Once you do that, it helps the oxidizing powder to destroy the oxidant demand and your tub can be treated again.

However, there is a downside to practicing the super chlorination process in your hot tub too.

While doing the process, you must keep your hot tub powered off and not use the tub until the FAC level is either brought back down normally or by force.

Method 2: Non-Chlorine Shocking Procedure

The non-chlorine shocking process is quite similar to the super chlorination process.

However, what makes this process different from the latter is that in this, you need to add an oxidizer to your tub which is not chlorine.

The most commonly used chemical used in this process is Potassium monopersulfate.

It is basically used to shock your hot tub and reduce the chlorine level of the water.

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Method 3: Using Enzymes

Another more efficient method to give your hot tub a non-chlorine shock is by using enzymes.

Unlike a proper oxidizer, enzymes do not reduce the combined chlorine levels in your tub directly.

Instead, they metabolize organic materials like body lotions, oils, and perfumes present in your hot tub.

This is important to make sure the chlorine present in the tub has less to oxidize, ultimately reducing the level of combined chlorine in the tub.

Method 4: Using Supplemental or Secondary Sanitation

If you are unsure about how to reduce the level of combined chlorine in your hot tub manually, then you can use this particular method.

In this method, you need to add a secondary or supplemental sanitation system to your hot tub to do the work.

This supplemental sanitation system efficiently reduces combined chlorine in your tub and also protects your body from chlorine-resistant microorganisms like cryptosporidium.

There are so many secondary or supplemental sanitation systems out there you can choose from.

Some of the major ones include the following:

1. UV pool sanitation

2. Ozone sanitation

3. UV + Ozone AOP sanitation, and so on.

You can easily get a sanitation system for your hot tub after consulting your hot tub manufacturer.

I highly recommend to try any one of these above mentioned methods if you really want to lower down the combined chlorine levels of your spa.

I am sure you will get the best results with these methods if you follow them properly.


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