Circulation pools that use the same water for a long period of time use pool purification systems to keep the water in the pool clean.  Without pool purification systems, the water can easily be contaminated with bacteria, algae, mildew, pathogens, and other unwanted organic matter in as little as a day with no purification.  Pool purification systems free the pool water from impurities and microorganisms that can be harmful to the swimming pool users. When a circulation pool goes without pool purification systems, the contaminants can spread outside the pool and into the air. They can contaminate the surrounding areas and cause illness, foul odor, and insects to the residents nearby.

Steps in pool purification systems

Pool purification systems undergo different steps to complete the process of purification.  In a pool purification system, tubes connect a purification plant to the swimming pool. The plant is installed in the area but is external to the swimming pool.  Water is transferred and circulated within the plant where it goes through several removal filters.  The water goes through the first filter that removes raw pollutions such as leaves, hair, and plasters from the water.  A flocculant is added to bind smaller colloids like skin tissue, saliva, skin fats, textile fibers, soap remains, cosmetic products, and other organic matter together. These matters are removed from the water through sand filters.  The pool purification system discharges all pollutants into the sewer. Finally, the swimming pool water purifiers are used to clean the filters and destroy all remaining pathogens.           

Swimming pool water purifiers

Swimming pool water purifiers are used for the final stage of pool water purification which is disinfection. They destroy the pathogens that pass through the filters that can include bacteria and viruses such as Campylobacter, Shigella, Escherichia coli, and protozoans like G. Lambia, and some forms of Cryptosporidia.

Some of the Swimming pool water purifiers are chlorine, Ozone, UV radiation, and ionization.  The most commonly used disinfection method is chlorine or some form of chlorine like chlorine dioxide and chloramarines. Chlorine is a very strong oxidant that kills microorganisms effectively. It is a toxic gas so it is used together with other agents like sodium hypochlorite to counter the danger it can cause to human skin and health.  The ozone method is popular in European countries.

It is effective in deactivating protozoans and some forms of pathogens.  It uses oxygen that passes through ultraviolet light and electrical discharges that act as disinfectant.  UV radiation also functions as a disinfectant similar to the Ozone method, but it does not fully kill bacteria like chlorine can.  Ionization is becoming a popular method because it disinfects minus the harmful effects of chlorine.  This process uses copper or silver as natural sanitizers by separating water and contaminants through ionization energies.  It is believed to be the safest method compared to other purifying agents. 
    
Manufacturers of purification systems

Purifying swimming pool water can cost a few dollars for traditional methods like chlorine to a hundred dollars for advanced and safer methods like ionization and ozone systems.  An example of a swimming pool water purifier manufacturer is Triangular Wave Technologies (www.triangularwave.com). It features the TWT Enhanced Control Pool Management Systems that include a TWT Deposit Control System, IonGuard Purification System, Copper/Silver Electrodes, and Reaction Chambers.  Triangular Wave Technologies provides safe and chemical-free pool cleaning systems.  The price can vary depending on the size of your pool and the time of purchase.  You may request for a quotation by visiting their website. 

Line-a-pool (http://www.line-a-pool.com/ozone.htm) offers an ozone treatment that is also safe, healthy, and chemical free.  The price can vary depending on the size and the usage of your pool. Check out its website for more information.

Another manufacturer of swimming pool water purifiers is Berson (www.bersonuv.com). It offers UV radiation treatment. Berson offers its SwimLine UV® that uses UV lamps that are submerged in the pool.