What's the Best Type of Chlorine Tablets for Your Swimming Pool

What's the Best Type of Chlorine Tablets for Your Swimming Pool

Use 70% chlorine Calcium Hypochlorite tablets for sanitization, opt for 90% purity to minimize scale, and employ slow-dissolving or granulated tablets for continuous or shock treatment.


Stabilized chlorine tablets are one of the most popular solutions for maintaining swimming pools. These tablets are known for their slow-release action and continuous sanitation advantages. They contain cyanuric acid, a substance that is added to minimize the dissipation of the chlorine in sunlight. Therefore, this solution can help pools in sunny locations to maintain an adequate amount of sanitizer in the water throughout the day.

Cyanuric Acid Benefits

Cyanuric acid offers multiple benefits to stabilized chlorine tablets. Firstly, this substance stabilizes the chlorine, which is why the tablets are called this way. It works as a UV stabilizer, and it is known that sunlight has the property to easily burn chlorine. Therefore, in an outdoor pool, an unstabilized form of chlorine would lose its efficacy in a short time. Moreover, cyanuric acid also helps the chlorine to release into the pool water in a steady motion. This way, it helps to preserve a certain level of sanitizer surrounding the tables until the next tablet is used. If no stabilizer was included, the sanitizer would be added in a high concentration every time, and in small pools, the effect would run out quite quickly.


Stabilized chlorine tablets are sold in a plethora of different sizes and formulations. Tyler seems to be using the more compact 3-inch diameter variety, which is typical for residential and recreational pool sizes. The bigger tabletops or pucks are typically used in larger pools, which are either commercial or belong to very lucky residential clients. When comparing the stabilized and unstabilized versions’ costs, one has to remember that, in the long run, the first alternative requires fewer reapplications and continuous sanitization of the pool.

Unstabilized Chlorine Options

Sunlight and heat are likely to have a damaging effect on unstabilized chlorine options, which, thus, are plain chlorine tablets and granules. Although such products are less expensive than their counterparts, they should be applied more frequently to be able to sustain the solution. As a result, one may assume that unstabilized chlorine options are a less practical solution to the identified issue.

Liquid Chlorine

The identified solution, which, in part, is based on the use of sodium hypochlorite, can be considered more practical and efficient owing to the possibility to apply the solution easily. As a rule, the amount of solution required can be measured almost perfectly, and the lack of clutter involved in the application of the given measure for enhancing the chlorine levels of pool water, which, in turn, makes the process of pool chlorine management fast and efficient. In addition, liquid chlorine is a perfect solution for shocking the pool. It is an efficient approach to pool sanitation, which, however, can be enhanced even further with the addition of certain chemicals.

Granular Shock

As a rule, granular shock refers to certain chemicals used to enhance the chlorine levels in pool water rapidly. The idea is especially useful when the pool has been used by a large number of people on a certain occasion or a pool owner has not used the pool for a long time. As a rule, granular shock dissolves quickly and efficiently in water and allows to enhance the levels of sanitizer on the spot.

Selection Considerations

When comparing stabilized and unstabilized chlorine options, it is worth noting that the ideal option depends on the pool’s location, usage, and meanings of convenience. For one, stabilized products are often considered more convenient, as they offer a consistent and prolonged sanitizing effect for the pool. Such options are recommended for outdoor use in hot climates. As for indoor pools and relatively stable situations when the parameters do not require frequent adjustment, unstabilized items might be a better option.

The barriers to selection are the fact that chlorine products are diversified in terms of the efficiency of disinfection and rates of dissolution. Stabilized chlorine tablets are known to dissolve in water at a slower rate, allowing for a sustained release of the sanitizer. Meanwhile, liquid chlorine and some other types of shock product dissolve on water contact, which means an immediate reaction. Moreover, the latter option is to be applied for frequent shocks, which might be inconvenient for some users. The choice of a product is primarily related to the pool’s location. An outdoor pool, especially in hot sunny climates, would be beneficial from the use of stabilized chlorine tablets as these are exposed to high UV doses. With UV division, the strong oxidants are broken apart before they can be measured, hence the consistent dosage. Meanwhile, an indoor pool might not benefit from either of the options, and unstabilized products or liquid few stabilized to be safe for indoor use should be preferred.

Final Thoughts

In conclusion, chlorine levels and the overall chemistry of the water require a balance to perform effectively. Hence, for any pool whatsoever, low maintenance should be thrown out as a choice. Based on the pool size, location, and intended usage, the most appropriate chlorine product can be selected. The size of the pool and the method of dispersing the chlorine are also important to consider. For example, larger pools may need larger quantities or alternate application methods, such as floating feeders for stabilized tablets or automatic feeders for liquid chlorine. When selecting between tablets, liquid, or granules, consider the ease of use, consistency of sanitization, and the desired level of chlorine control. Each of the three options has its own benefits and will be more appropriate for some pool types and maintenance routines. Above all, regardless of the specific product chosen, it is essential to store chlorine safely. The product should be stored in a cool and dry place, away from any direct sunlight or heat sources. It is also important to follow the manufacturer’s guidelines for handling and application of the product.

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