Home > Salins salts > How an electrochlorinator works

How an electrochlorinator works

In order to be suitable for pools, the water must meet several criteria: it should be clear, disinfected, disinfecting, and neither aggressive nor scale-forming. To achieve this, the resources used are: filtration, disinfection, treatment and analysis.

Salt electrolysis

• Electrochlorination (in situ generation of chlorine) is a gentle processing method based on a continuous cycle: the salt is transformed into chlorine which is converted back into salt, etc.

• Because it is semi-automatic, the electrochlorinator makes it possible to constantly maintain water of excellent sanitary quality. So it does not sting the eyes or attack the skin and has no chlorine smell. Electrochlorination is a treatment method that also means that storage and handling of dangerous goods are unnecessary.

Electrochlorination procedure

• Electrolysis is based on an electrochemical reaction: the pool water, which is slightly salty, passes between two plates that have been polarized with a low voltage direct current.

• This treatment process needs salt to function and produce sodium hypochlorite (NaClO), or bleach, to disinfect the pool water.

• The sodium hypochlorite produced immediately dissociates into hypochlorous acid which is a powerful oxidizing agent, destroying both organic materials and pathogenic germs, algae, bacteria and nitrogen pollutants.

• As salt treatment of pools is semi-automated, it makes it possible to constantly maintain water of excellent sanitary quality.

• Electrolysis takes place within a cell filled with electrodes and placed on the water recycling circuit. The electrodes, through which a low voltage direct current runs, are made of rustproof titanium and coated with a noble metal such as ruthenium or iridium. The salt concentration added to the pool is generally between 3 and 7 g/l (refer to the electrochlorinator instructions).

• After disinfecting and as a result of UV rays, the chlorine returns to the state of dissolved salt, which is again available for the production of chlorine. Ideally, with no loss of water, the process could therefore continue indefinitely. In fact, water losses through wintering, washing filters and overflowing, mean that a supply of fresh water needs to be added to the pool. These additions of fresh water must be supplemented by adding the same amount of salt to keep the electrolysis system functioning correctly.

• The salt electrolysis process makes it possible to:
- disinfect the pool
- give disinfectant properties to water
- ensure that equipment remains efficient
- ensure optimum bathing comfort