Disclosure: This post may contain affiliate links. This means that at no cost to you, we may earn a small commission for qualifying purchases.
Chlorination of the pool is an operation that helps to keep the pool water free of algae and bacteria. However, the indiscriminate and excessive use of chlorine can be harmful.
Usually, you will find chlorine sold in two formats on the market. There is the solid one – in powder, grains, or tablets – and the liquid one. Meanwhile, the best thing about chlorine tablets is that they ensure ease of dosing. By following the simple instructions on chlorination, it ensures you don’t have too much chlorine in the pool.
This review article will therefore give you in-depth information on what these substances are, how they work, how they are used, and what the best chlorine tablets to buy are. We’ll also tell you how to choose the best products and answer possible questions you may be asking.
What are Chlorine Tablets?
Chlorine tablets are basically compressed powdered chlorine. In this format comes the hydrochloric acid that is used for the maintenance of the pool. They slowly dissolve in water, therefore, disinfecting the pool water.
The small chlorine pills that are 1 inch in diameter and 16 millimeters thick weigh 14 grams. However, the large pills with 3 inches in diameter and 27 millimeters thick weigh 200 grams.
Regarding its appearance, it is generally presented in the form of small off-white tablets of 200g each, insolubility of 5.0 max., and humidity of 8.0 max. It also has a density of 0.70 to 0.90 g / mL approximately.
How Chlorine Tablets Work?
Pool chlorine tabs dissolve slowly in water, releasing chlorine gas into the pool. The pool chemicals kill bacteria and microorganisms that may be in the environment.
The chlorine tablets for swimming pools prevent the water in the pools from stagnating and above all to always maintain a good chlorine level. These tablets, while dissolving slowly in the water of the swimming pools, slowly but regularly increase the chlorine level so that the microorganisms present in the water can oxidize.
The tablets must be placed in the dispensers, which can be baskets (also called skimmer), lapping, or floating ones. Meanwhile, the latter is the most popular because they offer an excellent quality-price ratio and much more immediate use.
Chlorine is a chemical that kills the growth of bacteria and microorganisms both inside and outside the body. Therefore it is a toxic substance and harmful to health.
What happens is that the chlorine when it gets into the water, forms calcium hypochlorite and hydrochloric acid. These acids are toxic. In case of poisoning, you should go to the emergency doctor immediately.
For this reason, great care must be taken when dosing chlorine in swimming pools. It is advisable to read the product instructions first.
Where to Put Chlorine Tablets in Pool?
It is important to put it in places where integrity is preserved. Chlorine tabs are usually placed in the feeder, skimmer, and floating dispenser. However, you have to maintain the right dose and size of tablets for your pool. The optimal dose of chlorine to keep a pool clean is around 2 chlorinated tablets of 50 grams per 10,000 liters per week. After a rain, this dose should be doubled.
Best Chlorine Tablets: Our Top 8 Pick
In this review of swimming pool chlorine tablets, you will find products that have the best value for money.
1. CLOROX 3-Inch Pool&Spa XtraBlue Chlorinating Tablets
The Pool & Spa XtraBlue from Clorox is without a doubt the best in the pool and spa industry. It’s one of the bestsellers in Swimming Pool Chlorine catalogs online. The 3 in 1 formula offers a big advantage in your pool maintenance as it kills bacteria in the pool, prevents algae, and ensures long-lasting protection from sunlight.
Each chlorine tablet measures a 3-inch diameter and the product weighs 5 pounds. Clorox’s formulation essentially controls the growth of algae, kills bacteria, and prevents rust from building up.
Pool owners like how effectively it removes organic contaminants, ensuring better water quality, creating a smooth water sheet, and protecting the water’s chlorine from the sun. It’s therefore one of the best chlorine tabs for medium to large swimming pools.
2. Rx Clear 3-Inch Individually Wrapped Chlorine Tablets
These individually wrapped pills are some of the best chlorine tablets as they are simple to apply since you can use floating dispensers, a feeder, or skimmer to dispense them. RX Clear recommends them for chlorinator dispensary but we’ve seen a couple of pool owners use them successfully through the pool basket/skimmer. You can use them for gunite pool facilities or for large inground pools.
You’re required to add two chlorine tablets per 10,000-gallon of water until you get it at 1 to 4 parts per thousand. This, of course, requires a pool test kit to support these amounts. For easier handling during the application, each of these stabilized chlorine tablets is individually packaged, making them easy to manage as chlorine is very toxic, especially when concentrated.
The RX Clear chlorine tabs come in several container sizes, including buckets of 8, 15, and 25 lbs. Regardless of the size of this package, each has 3-inch chlorinating tablets containing 99 percent active ingredient of stabilized chlorine, killing bacteria and algae successfully.
3. Pool Mate 1-1405M All-in-1 Individually Wrapped 3-Inch Chlorinating Tablets
Containing 3-inch tablets, the Pool Mate product contains 10 individually wrapped tabs. The components contain chlorine which is used to purify the water from contamination such as algae and bacteria. These pills also behave as stabilizers or conditioners, thanks to the cyanuric acid inside. It, thus, protects chlorine from degrading after being subjected to UV rays from the sun.
Therefore, it disinfects more, preventing chlorine loss. But you need to use a test kit so as to make sure that the stabilizer remains at 40 to 100ppm, chlorine between 2 to 4ppm, chemical balance (pool pH) between 7.2 to 7.6 ppm, as well as the total alkalinity from 70 to 140ppm so the pills can give you great results.
This item can be found in 4 distinct container sizes, including 5, 10, 15, 25, and 40 lbs buckets. Each container includes tablets individually wrapped, ensuring ease of use as well as safe handling. It should be dispensed at a rate of 1 to 3 tabs per 10000 water gallons using floating chlorine dispensers or a feeder.
4. Clorox Pool&Spa 1″ Chlorine Tabs for Small Pools
For small pools up to 5000 gallons, the Clorox Pool & Spa 1-inch stabilized chlorine tablets are quite easy to dose for your pool since you can dispense them with a float or feeder. The suggested dose is 1 pill per 5000 gallon. This, however, requires a test kit so you can get these amounts.
Clorox indicates that you can use the chlorine pool tablets for swimming pools and spas and we’ve seen a lot of pool owners who used it successfully for their spas. It’s also recommended for hot tub use, for Intex pool or other above ground rigid or inflatable pool models.
However, unlike the XtraBlue and the Active99, this does not come in several container sizes. Each pack has 45 one-inch pills containing an active ingredient of stabilized chlorine to successfully kill algae and bacteria.
5. Pool Mate 1-1407 Jumbo 3-Inch Chlorinating Tablets for Swimming Pool
If you want a bactericide and algaecide, you need to get the Jumbo Tabs from Pool Mate. The components contain individually wrapped chlorine which is used to purify the water from contamination such as algae and bacteria.
Like the Pool Mate 1-1405, these pills also have stabilized chlorine active ingredient, preventing your disinfectant from being degraded after it’s subjected to UV rays from the sun so it can disinfect more, reducing the demand of chlorine.
This item can be found in 4 container sizes, including 7, 4, 15, 25, and 40lb buckets. Inside the containers are 8 ounces or 227g 3-inch tablets which are individually. Also like the Pool Mate 1-1405, each should be dispensed at a rate of 1 to 3 pills per 1000 gallons of water using a float or an inline feeder.
6. Qualco Giant 8lb 3inch Swimming Pool Chlorinating Tablets
The Qualco brand chlorine tabs are a concentrated type of pool chlorine. Pool experts highlight above all how simple it is to use since it allows you to carry out an efficient shock treatment as long as the pH of the water is adjusted. It’s an 8-pound chlorinating tablet bucket. The 3-inch tablets have a 3-in-1 action; it works as a bactericide, disinfectant, and algaecide.
The pool chlorine is especially concentrated which is especially interesting to keep the water in your pool especially clean at all times. In addition, the pool chlorine does not incorporate calcium or another type of hypochlorite in its composition, so you will not see cloudy or white water at any time nor will you have to worry about these side effects.
7. Members Mark Chlorinating Tablets 40LB 3″ Tablets
The Members Mark enters our list of the best chlorine tablets as it is the best newly released swimming pool chlorine. Formulated without stabilizer, the Members Mark product contains 3 inches of chlorinating tablets and requires the purchase of stabilizers separately.
The unstabilized chlorine tablets come in a 40-pound bucket. It has different functions; you can use it as an algaecide, disinfectant, and bactericide. Each chlorine tablet consists of 90 percent chlorine.
Professionals and experts who have used other chlorine tabs for a long time are clear that this type of chlorine is the most efficient. It should be noted that the price is quite high due to temporary shortage but without a doubt, it is also a good quality product and highly recommended.
8. Qualco QLC-10LB Slow Dissolving Fast Acting 3 Inch Swimming Pool Chlorinating and Sanitizing Tablets
Yet another entry for Qualco, this is a multifunction product. The bucket contains multi-action unstabilized chlorine tablets with around 250 grams of slow dissolving chlorine. It’s perhaps the slowest dissolving chlorine in this list and is ideal for the complete treatment or maintenance of the swimming pool water in an optimal state. The slow dissolving tablets have a triple action: as a disinfectant, algicidal and bactericidal action.
The bacteria and algae eliminator is the perfect option for disinfecting swimming pools. It is very easy to dose and especially efficient since you will simply have to place the tablets in the skimmer basket, chlorine dispenser, or an automatic chlorinator in a very practical and simple way. The 3-inch chlorine tablets contain 90 percent of chlorine and are perfect for all types of pool. You can use it for above ground pools, for vinyl pools, for inground pools, and saltwater pools.
Features to Consider While Purchasing
Do you need the most suitable chlorine tablets for your pool? Would you like to know what to look for when buying? And do you have any more questions? Then you should read this guide carefully. After reading it, you will know what is important, which tabs you need, and what this product is about. First, we’ll tell you the features to consider while purchasing. The most important include:
The types of chlorine tablets
There are three different chlorine tablets. These are the fast-dissolving pills, long-term tablets, and multifunction tablets:
Fast chlorinating pills
Typically, fast-dissolving tablets are also known as shock chlorinating pills. They weigh 20 grams each and should be used after you’ve refilled your pool so that you can perform shock chlorination. These chlorine tablets are of the quick-dissolving variant, so that chlorine is released into the water more quickly. This means that the chlorine value is reached quickly.
Shock chlorination can also be carried out if the chlorine value is very low after a measurement. You can also use fast tablets for permanent chlorination, but then you have to add chlorine tablets more often.
Long-term chlorine pool tablets
Long-term tablets are only suitable for long-term chlorination, as these variants dissolve slowly. The weight per tablet is around 200 grams. A floating chlorine dispenser can be used to influence how much chlorine is added to the water.
If the chlorine value is too low, the metering float can be opened. This allows chlorine to escape. As soon as the desired chlorine value is available, the dosing device can be closed completely or partially.
How much of the long-term tablet is needed depends on the chlorine levels in the tablet. Finally, there are long-term tablets that have 90 percent chlorine content and also variants that have, for example, only 60 percent chlorine content.
Please note: If the chlorine content in the chlorine tablet is low, more must be added. The chlorine content is stated on the label. Chlorine tablets with a low chlorine content are often cheaper than products with higher chlorine content. Bear in mind that if the chlorine content in the tablet is low, you will have to re-dose more frequently and the consumption will be higher.
There are numerous names for multifunction tablets. For example, these are called multi-tabs, all in one tabs, 3 in 1 tabs, or combitabs. However, each is the same product. Among the various chlorine tablets, these are arguably the most popular. The weight can vary between 20 and 200 grams per tablet
This is a long-term tablet that consists of chlorine, a pH stabilizer, and a flocculant. The pool water is disinfected with chlorine and the flocculant ensures that the pool water is clear, as it binds the finest suspended particles. pH stabilizers, on the other hand, increases the pH value.
These tabs are particularly recommended because they contain all the important ingredients. Many users of multifunction tablets are extremely satisfied with the product. Certainly, there are fewer of all ingredients in multi-tabs, so the pH value and chlorine content should still be checked. However, basic care is well taken care of with Multitabs.
Place of use
Chlorine tablets can be used in many different areas of application. It can be used for fountains, swimming pool, whirlpool/jacuzzi paddling pool, children’s pool, pond, rainwater, and drinking water
Depending on the location you want to keep away from algae and bacteria, you need different chlorine tablets. The suitability of each chlorine product is specified in the product description or product label. However, most chlorine tablets can be used for two to three of the above listed applications.
If you just put the chlorine tablets in the pool directly, this can cause bleaching in liner pools, for example. We are therefore introducing you to the common dosing options for adding chlorine tablets into the pool. Each of these dosing options causes the chlorine tablets to dissolve in the water.
Adding chlorine tablets can be done in different ways. Many pool owners use so-called floats (also called dosing containers, dosing devices, or automatic chlorine dispensers). Floats are available in different sizes for every pool size. However, you should always remove the dosing float from the pool for bathing.
Another variant is the chlorine dosing machine. You do not need to remove these before using the pool. This is built into the return of the filter technology. The machine also has a higher filling capacity. You can therefore travel for a longer period without any problems, as post-chlorination of the pool will not be necessary even then.
Under no circumstances should you put slow dissolving chlorine tablets in the skimmer. A pool skimmer is used to suck in the water through the pool pump. Therefore, pool chlorine tablets dissolve in the skimmer faster than intended. The pool is over-chlorinated by dissolving too quickly and the pool liner is bleached as a result.
How much chlorine is required in the swimming pool depends on the pool size. You can use the following formula to help you calculate the basin contents:
Length in meters x width in meters x average depth in meters = pool volume in m³
The chlorine content of the pool water should always be 0.5 to 1.0 milligrams per liter of water. You can find out how many pool chlorine tablets you need for the calculated pool volume in the respective product descriptions.
Organic or inorganic chlorine tablets
Organic chlorine tablets contain stabilized chlorine. That is, they have cyanuric acid that acts as a stabilizer. This stabilizer slows down the reactivity of the chlorine and thus has a more even and slower effect.
Inorganic chlorine tablets, on the other hand, are very reactive, but contain no cyanuric acid. For example, due to increased water temperature, UV radiation, or increased use of the pool, these are reduced quite quickly. This means that frequent post-chlorination is required and you should check the water values daily.
Common Questions and Answers
Are chlorine tablets better than granules?
As soon as granular chlorine is added to the pool water, it dissolves and the effect is quickly developed. In addition, chlorine granules are also popular when the bathing season begins. Compared to chlorine granules, chlorine tablets develop their effect over a longer period and more slowly. So when it comes to pool cleaning, chlorine tablets are an extremely popular alternative due to their long-lasting disinfectant effect.
However, in comparison, chlorine granules consist of sodium chloride and can be added directly to the water. Chlorine tablets however contain trichlor and can only be added to the pool through a dispenser. Meanwhile, another form of chlorine is liquid chlorine, which is mainly unstabilized, less costly, and comes in the form of liquid, but with the same active chemical composition as granular chlorine.
Can chlorine tablets be stored outside?
Yes, most chlorine tablets are best stored in a watertight plastic container outside in a shaded area, away from direct sunlight exposure. However, the garage or any other place that is prone to exhaust fumes is a wrong place to keep chlorine. During storage, the container should not be exposed to frost and should be well closed.
Will chlorine tablets kill mosquito larvae?
Pool chlorine tablets are not formulated to kill mosquito larvae. They are made for killing algae, bacteria, and other microorganisms. However, some chlorine tablets will hinder the growth of larvae.
How long will chlorine tablets last?
Trichloro or stabilized chlorine tablets can last for two to three days in the pool water. Tablets that dissolve slowly can however last for four to five days. When stored properly, chlorine tablets can last between 3 and 5 years.
When to put chlorine tablets in pool?
If you have no other way of reliably disinfecting the pool, disinfection with chlorine is the best option. This water treatment is necessary so that bacteria and germs are killed and no new ones are formed. Chlorine tablets can also be used to treat pools after rainfall, after heavy use, or after you start noticing algae growth.
If you do not want to change the pool water within a few days because it constantly tips over due to bacteria, viruses, and fungi, then chlorine tablets are recommended.
Chlorine tablets do what they’re supposed to keep pool water clean and hygienic and make owners feel good about using the pool.
We are happy to recommend the products from our list of the best chlorine tablets, so that you can finally find a solution against cloudy and contaminated pool water.