Chlorine Tablets

What’s The Most Common Chemical Used In Pools?

It is a fact that chlorine is the most common chemical used in pools. It is cheap, effective and has been  registered with the EPA and Health Canada for decades. It kills 99.9 % of disease causing organisms. It acts as an oxidizer to dissolve non-living contaminant waste, and leaves a measurable residual behind.

The primary role of chlorine is to kill disease-causing micro-organisms such as bacteria and germs. Swimmer contamination is the largest cause of unclean, unsafe, and unsanitary pools. We are animals, and every time a swimmer jumps into the pool for a swim, millions of particles of contaminants are dispersed. Showering beforehand helps a great deal, but we still shed. But not as much as , say, the family dog. The contamination from the family dog is the equivalent of having 50 people swim in your pool at the same time.

Chlorine disinfects water by killing germs. Oxidation destroys non-living waste materials such as skin and hair follicles, perfumes, deodorants, hair products, swimsuit contaminants, and sun tan products. Adding additional oxidation material, such as C*Pool&Spa, (anhydrous form of copper sulphate),  a non-chlorine shock product, (such as potassium monopersulfate), or enzymes helps chlorine do its job.

How Does Chlorine Work?

When mixed with water, chlorine forms hypochlorous acid (HOCL) and (a by-product) hypochlorite ion. It is the HOCL that is the killing agent. When the pH is between 7.2 and 7.5 the balance of HOCL is in the  ideal range of performance.

Liquid chlorine is sodium hypochlorite that leaves sodium chloride behind as a by-product. This will cause an increase in total dissolved solids. Not a problem if the pool water is normally soft. For pools in areas of hard water (high calcium hardness as well as high alkalinity and pH), it is recommended to use Trichlor or Dichlor pucks. Chlorine products that contain CYA (cyanuric acid) may be preferred as CYA helps as a stabilizer to improve the performance of HOCL by protecting the destruction of HOCL from sunlight. Trichlor or Dichlor pucks typically contain the CYA stabilizer (hence the term “stabilized chlorine pucks”) and will slightly lower alkalinity and pH. 

Chlorine has a dual purpose. It is a great algae killing agent. However, it must be understood that if there is plenty of algae present or continually introduced, it will greatly interfere with the primary purpose of chlorine, that is, killing bacteria. The HOCL will be rapidly depleted, sometimes within hours, unless another agent is introduced to help kill algae. The most used algaecide in the world is copper sulphate. C*Pool&Spa is ideal for the purpose of killing algae, allowing chlorine to kill bacteria and germs more efficiently. The two work as a perfect combination of cost and efficiency to keep pools clean, clear, and safe.