Equipment for on-site production of sodium hypochlorite from salt allows the application of disinfectant in the place of consumption, avoiding the need for its storage. These devices have emerged as an alternative to conventional systems for dosing of sodium hypochlorite and other disinfectants. As a rule, and recommended by manufacturers, this equipment is used for closed systems with a constant chlorine consumption and with slow changes of dosing rate so the production can follow fluctuation.

According to the principle these systems can be classified into two groups: tubular cell electrolysis and membrane electrolysis. Tubular cell electrolysis takes place in a common chamber containing two electrodes, while the membrane electrolysis system takes place in two chambers with electrodes separate with membrane.

Devices designed for sodium hypochlorite and chlorine gas production from salt, are particularly suitable for swimming pools and for small industrial water systems. Concentration of produced hypochlorite is about 0,5-1,15% of active chlorine, which is ten times lower concentration, compared with commercial product. Production capacity of these systems are limited and previously presented to each user, as wel as power consumption, which is significant.