What Is The Best Liquid Chlorine For Pools?

Pool maintenance is definitely a no walk in the park, especially when it comes to learning all the chemicals and processes that are required for the job. Aside from that, it is a heavy task that will take much of your time if you are a new pool owner and among the main things that you should consider when it comes to pool maintenance is the proper handling of the chemicals.

What is the best liquid chlorine for pools? There are plenty of liquid chlorines available today. It includes Pure Bright Bleach, HASA Sodium Hypochlorite, Kem-Tek Chlorinating Liquid, and Pool Essentials Chlorinating Liquid.

A Must Read: What Is The Best Pool Brand?

In this article, you will find out about pool chlorine and the difference between stabilized and unstabilized chlorine. It will also discuss how much liquid chlorine to use.

The Basic Concept Of Chlorine

Chlorine is your basic solution when it comes to dealing with infected pools. It is a chemical element that produces electrolysis of saltwater responsible for killing harmful bacteria with a chlorine level of 12 – 15 %. Chlorine is also found in bleach and other household cleaners to clean and disinfect your home. It can also be found in salt and naturally present in the ocean and other compounds.

Stabilized Chlorine

Chlorine can be either stabilized or unstabilized, depending on its usage. Stabilized chlorine can be either liquid, tablets, or granular shock, and it is just chlorine with added cyanuric acid.

Cyanuric acid is a stabilizer, and you can buy it separately if needed. Although, there is plenty of chlorine available that has CYA added to it already. The importance of CYA in your chlorine is that it acts as a buffer and helps chlorine stay active for a longer time.

Unstabilized Chlorine

On the other hand, unstabilized chlorine is just plain chlorine without the cyanuric acid. If you have a high CYA level and it gets to an alarming number, it can diminish the effectiveness of your chlorine. It can also lead to chlorine lock.

A chlorine lock is a state where your pool’s water chemistry keeps showing a very low chlorine level regardless of adding more to it. Unstabilized chlorine is one of the top choices for indoor pools or pools that aren’t much exposed to the sun.

The Best Liquid Chlorine

Liquid chlorine is made by bubbling the gas form of chlorine through a caustic soda. It has a high pH level of around 13 and can conveniently be poured directly to the pool.

Usually, you used liquid chlorine in a large commercial pool because it can be added in bulk. It is also often cheaper compared to other forms, and it needs more acid to be added in the water. This way, it can counteract the high pH level.

Pure Bright Bleach

This Pure Bright Bleach is the most affordable and easy to measure bleach out there. It is also called sodium hypo that comes in liquid form that contains around 10 to 12% available chlorine.

As far as pool sanitizer goes, bleach is very common in both residential types and commercial pools. But, it is leaning towards a commercial pool nowadays because it can be easily added in large volumes. For most pool service professionals, sodium hypo is one of the popular for many reasons, and being low cost is one of them.

If there are pros, surely there are cons when you decided to use a sodium hypo. When it comes to shelf life, depending on the circumstances, is not great. It easily deteriorates in a matter of weeks. It is why many pools use stabilizers like CYA to give chlorine a longer lifespan in the water. 

HASA Sani-Clor Sodium Hypochlorite

One of the popular ones when it comes to liquid chlorine is the HASA Sani-clor Sodium Hypochlorite. It is one of the most recommended for pool chlorination by most experts.

It is because it can do 99% of your pool water sanitation needs. That includes clearing, preventing any cloud in the water, and, most importantly, removing all bacteria and other contaminants in the water.

Sodium hypochlorite liquid chlorine by HASA has 12.5% of chlorine and calcium and cyanuric-acid free. It is recommended to fight high calcium hardness and high CYA levels in your pool water.

This product is on high-demand, you can buy it online or go to your nearest pool service maintenance shop. You can find HASA dealers across several states in the United States, including Texas, Arizona, California, and Washington.

Kem-Tek Chlorinating Liquid

Another option to take into consideration is the Kem-Tek Chlorinating Liquid. It has 10% chlorine, and you can pretty much get it in Amazon or your local pool services store. Kem-Tek is perfect for your everyday chlorination and weekly shock treatments.

It is cloud-free and calcium-free, and it costs way less than any calcium-based products. You can either get a 1-gallon set or four 1-gallon box set.

It is known that Kem-Tek liquid chlorine is very effective, and it works faster because it can mix quickly with your pool water. It is recommended for all pool types and a perfect alternative to chlorine tablets and granules.

Pool Essentials Chlorinating Liquid

Pool Essentials is a brand that will keep your swimming pool clean and clear in the entire year. It provides you with great pool products that are effective and very affordable.

One of their holy grail is the Pool Essentials Chlorinating Liquid. It is a must-have cleaner if you have a swimming pool. Within two hours, you will have a pool that is as good as new, and you can immediately see the result.

This chlorinating liquid is responsible is killing all bacterias and algae present in your pool. Another great thing is that this chlorine is compatible with salt-systems and does not have any calcium and no possibility of adding minerals in your pool.

How Much Liquid Chlorine To Add

Pool owners have their way of maintaining their pools, some opt for tabler or granular forms, but a few choose to use liquid form. It is recommended to work with an automatic dosing unit because it adds chlorine to the pool one drop at a time.

It is to make sure that you are getting the right level every time you add liquid chlorine. In case you didn’t have any, you can always add liquid chlorine by hand, but it will be a little difficult to measure properly.

First, check how many gallons of water your swimming pool holds. Then you can test the chlorine levels to determine how much it needs. The rule of thumb is never to add more than half a liter per 50,000 liters. If you add more, this will not have a positive impact on water quality as a whole.

It can even cause you more damage to your installation. Most products that you buy will be for 10,000 gallons of pool water, and if you have a bigger pool than that, you need to buy more products.

How To Use Liquid Chlorine

Liquid chlorine is 4 to 6 times stronger than regular household bleach, and it is a very hazardous material. It is why it is important to practice caution and be careful when using it.

If it happens to come in contact with your skin, you should immediately rinse off thoroughly with a hose or shower. Always use protective gear like eyewear and rubber gloves when dealing with liquid chlorine.

Liquid chlorine is not a stabilized form of chlorine, so it is best to add them at night to prevent the sun from burning them. A lot of pool professionals recommend that your pool’s free chlorine level should be kept above 1ppm.

If it reaches above 3 ppm, you will end up experience eye and skin irritation. To keep it within the healthy range, it is essential to test your water regularly and adding chlorine only when necessary.

Once you figure out how much chlorine you are going to add, with your pool pump running, gently pour it into the deep end of the pool. Make sure to leave the pump running overnight. It is to keep the chlorine circulating the pool properly. It is also important not to enter the pool until the chlorine is below 3 ppm.


Overall, it is essential to test your pH and alkalinity levels before you add chlorine to make sure you are not adding more to its current state. Testing the water is an essential task that you should never skip. It is also vital to note that handling chemicals are dangerous, so proceed with caution.

Keep them off your skin and away from children and pets. At this point, you have enough knowledge regarding liquid chlorine. You should be able to enjoy your sparkling pool all year. Always keep your pool sanitize because that means it is clean, safe, and enjoyable to swim.

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