Chlorine generators
On-site chlorine generation is growing in popularity in North America. Most new residential pools have generators installed when the pool is built. These systems are popular in other parts of the world as well, for example, the majority of pools in Australia have chlorine generators. By creating free chlorine in the water, chemical storage, transportation, chemical feeders, and handling is reduced.

In-Line Generators

 In-line generators introduce chlorine directly into the circulation line of the pool or spa. First, salt is added to the water. Usually 3,000 to 3,500 ppm (mgIL) of salt is added to the pool or spa water. Some systems may use salt levels as high as 8,000 ppm (mgIL). To achieve 3,000 ppm (mgIL) of salt, at least 250 lb (115 kg) of salt is added for every 10,000 gallons (38,000 liters) of water. The salt itself is not the disinfectant; the circulation system forces water through an in-line unit also called a "cell" installed in the circulation system. The cell contains layers of plates that are electrically charged by the generator's power supply. The plates in the cell convert salt to free chlorine by a chemical process called "electrolysis."

The free chlorine that is produced has only a minor effect on water chemistry, the pH tends to increase slightly over time.

Traces of hydrogen gas are produced, but they are vented to the atmosphere. These systems have an interlock so that the chlorinator is shut down if the pump is off and the small level of hydrogen gas does not build up to create an explosion hazard. Additionally, to prevent scale build-up on the plates, the generator's control unit periodically reverses the charge on the plates. Care must be taken to ensure that the hydrogen gas does not interfere with the probe measurements.

In-line chlorine generation is almost self-sustaining. The chlorine generated by the system reverts back to salt and water and is thus available to be oxidized again to chlorine. Salt addition is necessary to replace losses due to filter backwash, rain water dilution, user drag-out, and splash out.

Chlorine generators can be automated. Newer generators also measure the amount of salt in the water and provide an electrical adjustment to compensate for a steady chlorine generation level. Some generators can sense if the salt level in the water is outside the desired range and signal the operator with a warning light.

Chlorine generator destroyed stereotypes about chlorine disinfection of water.  The traditional disinfection of pool water using chemicals is fraught with certain dangers and difficulties: transportation and storage of toxic and strong-smelling drugs, procedure and frequency of use, the risks of overdose. However, this traditional process of disinfecting the pool water can be improved and simplified at the same time, just install the chlorine generator.

 Advantages of chlorine generator:

  • Cost: the installation of a chlorine generator will reduce the cost for conventional chemistry to 80%. The only service that you would need to perform is to clean the electrodes from time to time.
  • Comfort: the water is disinfected automatically, passing through the circulation system of the pool.
  • Environmentally friendly: using generator significantly reduces harm to the environment: pollution of soil and water when draining the water with chemicals.
  • Safety: no need to worry about transportation and safe storage of chemicals.


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