Stabilised Chlorine Granules


Happy New Year to you all and welcome to our first blog post of 2012. Our biggest selling product of 2011 was Stabilised Chlorine Granules which came as no surprise as it is the most popular pool and spa chemical on the market. But what exactly are Stabilised Chlorine Granules and what makes it such a popular product amongst domestic pool and spa owners?

What are Stabilised Chlorine Granules?

Sodium Dichloroisocyanurate is the chemical that forms Stabilised Chlorine Granules and it has an available chlorine content of 56%. You may also see it referred to as troclosene sodium dihydrate. They are a white granular solid and are manually dosed to the pool or spa as and when needed. They have a pH close to neutral (7) so will have little effect on the pH of the pool water. As well as containing chlorine, they also contain cyanurate which acts as a stabiliser to prevent the chlorine being broken down by the sunlight.  A trait most welcome in outdoor pools.


In addition to the advantages that the cyanurate provides, Stabilised Chlorine Granules also have many other benefits. It can perform many roles as it is one of the few chemicals on the market that can be used on both pools and spas that run on chlorine. In addition to this it can also be used as a sanitiser and a shock treatment on small above ground pools and spas where the water is emptied regularly. As it appears in a granular form and is very soluble, it means you can use them to provide a quick boost of chlorine if you have a low chlorine level. This can be priceless if you wake up on a hot summer’s morning to find you have no chlorine in your pool!! The final and probably most important benefit from a customer’s point of view is the price. Stabilised Chlorine Granules offer excellent value for money and are generally a lot cheaper than stabilised chlorine tablets and unstabilised chlorine granules (chlorine shock).


Although Stabilised Chlorine Granules have many benefits it is important to note that they do have some drawbacks compared to other forms of chlorine on the market. Its chlorine content of 56% is low compared to stabilised chlorine tablets and unstabilised chlorine granules. If used as a sanitiser it can also be difficult to maintain an adequate level of chlorine in the water. When you add the chlorine granules to the water there is an immediate boost in chlorine content which gradually reduces. If the pool is busy it can be used up quite quickly. This is not the case with chlorine tablets as you have the peace of mind that you have a slow releasing dose of chlorine at all times. If you use stabilised chlorine granules as your only sanitiser you will need to test and dose the pool very regularly to ensure that algae or other micro-organisms do not start to grow in the pool (this is particularly true in hot tubs where chlorine disappears very quickly).


I believe that every pool or spa owner who uses chlorine should have a small amount of Stabilised Chlorine Granules on stock as they are excellent for a quick boost of chlorine. However regardless of what size pool or spa you have I wouldn’t necessarily recommend using them as your only source of sanitiser. I would always recommend using either Stabilised Chlorine Tablets or Multifunctional Tablets as they provide that constant dose of chlorine at all times and you don’t have to mess around with dosing.

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