How to Keep Chlorine Level Up in a Hot Tub? – 2 Main Reasons for Low Chlorine Level and 1 Solution


how to keep chlorine level high in hot tub

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A Low Chlorine level in your hot tub has higher chances of getting you various skin infections and sickness.

Yes, I am not joking.

Hot tubs are items of regular use and different members of your family or your friends step into them every day.

Due to this, the hot tub gets dirty with germs, bacteria, fungus and viruses and if not cleaned regularly, can lead to severe infections and health ailments.

To keep them clean and fresh, hot tub sanitizers are most essential for your hot tub cleaning and disinfection.

These sanitizers are usually sodium di-chlor granules.

Chlorine is a fan favorite in the game because it is easy to add and highly effective at eliminating bacteria and keeping your tub clean and fresh.

The usual chlorine level of your tub should be between 2 to 4 PPM.

But if the level goes down, your tub might not be a safe place to be in.

So, how can you keep the chlorine level up in your hot tub?

One of the best ways to do this is by shocking the hot tub.

Shocking the tub allows you to level up your hot tub chlorine level for a decent period.

This process is done to eliminate bacteria, remove bromines, and reactivate bromides in the tub to make it cleaner and fresher.

You can shock your hot tub every week or after every house party.

So, this is one way you can keep the chlorine level of your hot tub up for a some period of time.

But what if this doesn’t work?

Well, I have few more methods for you that will help you to maintain the chlorine level in your hot tub.

I have mentioned them in the further part of the article.

I have also discussed a few important topics that you should be aware of related to chlorine level in your spa.

Can You Go in a Hot Tub with Low Chlorine Level?

You can but I highly recommend you shouldn’t go in your hot tub when its chlorine level is extremely low.

As I have said earlier, the ideal chlorine level in your hot tub must be around 2 to 4 PPM.

If your tub has a lower level it means that your tub contains bacteria and other harmful microorganisms.

And stepping into such dirty water can be quite harmful for your health and for your loved ones too.

2 Main Reasons Why Chlorine Level Keeps Dropping in a Hot Tub

Your hot tub’s chlorine level is just dropping every day and you are just finding it hard to control that level to a safer level.

Well, the very first thing you need to do is understand why the chlorine level of your hot tub keeps lowering down gradually.

Here are 2 main reasons that cause chlorine level to drop gradually in your hot tub.

Reason 1: Chlorine Breaks Down Very Quickly in the Heat

If you know basic chemistry, you would know that chlorine breaks down quickly when heated.

That’s the property of this chlorine element and you can’t do anything about it.

What you can actually do is add bromine to clean your hot tub.

However, there are a few issues with that as well which you need to tackle properly and I have discussed them in my other article which you can read by clicking here.

Reason 2: Biofilm and Other Contaminants are More Powerful Than A Chlorine Sanitizer

A biofilm is a group of microorganisms such as bacteria, fungi, and viruses.

Sometimes, these microorganisms gain a strong foothold inside the plumbing of your hot tub.

Then it becomes quite hard for your chlorine sanitizer to fight and kill them in the tub.

And the sanitizer is wasted trying to kill this biofilm.

That can be another reason why your hot tub chlorine level keeps dropping down frequently.

In this case, people are unaware of the fact that sanitizers can’t solve their problems.

They just keep using sanitizers for no use.

What actually can work for them is a product designed to purge or flush out the collected dirt from your hot tub plumbing.

One such tested product that I can recommend you to use is the Oh Yuk Healthy Hot Tub Cleaner.

This cleaner is really good in removing water contaminants from hot tub pumps and improving water filtration of your spa.

It helps you to clean dirty filters and also enhances the water flow of your tub.

Click Here to Get Oh Yuk Healthy Hot Tub Cleaner for Your Spa.

How Often to Add Chlorine to Your Hot Tub?

Depending on how roughly your hot tub is used and by how many people, you should decide how often you should add chlorine to your hot tub.

For example, if your hot tub has decent usage, adding chlorine to it every 2 to3 days can be fine.

In case there is heavy usage, you may increase its frequency and you can do that every second day.

The dose of the chlorine added also depends on how frequently it is used and by how many people.

Usually, adding 2g of chlorine per 1000 liters of water is good to go.

Recommended Articles for You:

Learn How Much Power Your Hot Tub Requires to Run Successfully

4 Steps to Switch from Chlorine to Bromine Level in Your Hot Tub

5 Steps to Enjoy Bubble Bath in Your Hot Tub

3 Tips to Remember While Adding Chlorine to Your Hot Tub

How Fast Does Chlorine Dissipate in a Hot Tub?

As we have learned in the previous sections, chlorine dissipates quickly in the presence of heat.

Usually, 1 PPM of unstabilized chlorine dissipates within 15 minutes in a hot tub under direct sunlight.

In heated water, this rate even increases to a greater extent.

It also depends a lot on how much chlorine you are adding and how much water.

For example, it will take around 1 to 48 hours for the chlorine particles to completely dissipate into a medium-sized hot tub.

Well, this time goes over 40 hours in rare cases.

What to Do When No Chlorine Reading After Shocking a Hot Tub?

When you shock your hot tub, your hot tub gets cleaned and becomes good to be used.

In this process, chlorine plays an important role.

But what if you see no chlorine reading after shocking your tub?

Why it happens and what can you do in this case?

Well, there are a few reasons that can cause this problem.

Reason 1: The pH and the total alkalinity of your hot tub are unbalanced.

Reason 2: The chlorine you added to your spa is being used faster than required.

In the first case, you can test the pH level and the total alkalinity of your hot tub and fix that accordingly.

In case your hot tub pH is too high, go through this quick article to drag the pH of your tub down to normal.

And if you want to increase the pH of your tub, just follow the simple tips mentioned here.

Now, in the second case, the chlorine you are adding to your tub is being used faster than required.

This may be due to the biofilm dominating the plumbing of your tub.

In this case, I highly recommend you to use the Oh Yuk Healthy Hot Tub Cleaner to fix the issue.

2 Solutions to Fix Chlorine Lock in a Hot Tub

In simple words, a chlorine lock is a situation where your chlorine turns out to be useless.

In such a situation, no matter how much and how many times you add chlorine to your tub, neither it works nor the chlorine-free level goes up in the tub while testing.

A few of the major causes for this situation is too much presence of cyanuric acid or chlorine stabilizer in your hot tub.

Chlorine lock is really annoying and can make you really worried for the poor hygiene of your spa.

But worry not, I know how to break it, and below I have shared 2 methods for doing that as well. 

Solution 1: Partially Drain Your Hot Tub

Draining your hot tub is itself a cure to lots of hot tub issues.

When the chlorine lock is caused by too much presence of cyanuric acid, partially draining the tub will definitely work.

Cyanuric acid does not dissipate in your hot tub water so it can be easily drained away.

I recommend to try this method to see the results for yourself.

Solution 2: Use a Cyanuric Acid Reducer

Well, this seems obvious.

If the chlorine lock in your hot tub doesn’t get broken following the first method, try using a cyanuric acid reducer to fix it.

Click Here to Get Cyanuric Acid Reducer for Your Hot Tub Water.

1 Effective Method to Increase Free Chlorine Level in Your Hot Tub

If your hot tub has a good total chlorine level but a low free chlorine level, it might be saying, Hey, I need a shock! Hehe!

You can do it quite easily by adding an oxidizer to your tub.

This oxidizer will eliminate chloramines from the tub and reduce the waste by literally burning them off.

And guess what this will ultimately raise the free chlorine level in your hot tub.

Click Here to Get the Best Spa Shock Oxidizer for Your Hot Tub.


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