According to the appointment ...

According to the appointment of MR. Juan José Salas Rodríguez:

"In Spain, Order SAS / 1915/2009, of July 8, on substances for the treatment of water intended for the production of water for human consumption www.boe.es/boe/dias/2009/07/17/pdfs/ BOE-A-2009-11876.pdf, in Part B. Biocides. B1 Active substances included in the type "disinfectant for drinking water, both for humans and animals", includes the following compounds related to chlorine:

• Chlorine

• Chlorine dioxide

• Calcium hypochlorite

• Sodium hypochlorite

• Trichloroisocyanuric acid

• Dichloroisocyanurate sodium, anhydrous

• Dichloroisocyanurate sodium, dihydrate

However, for the last three products (including trichloroisocyanuric acid, or trichloro), the conditions of use specify:

• Previous biocides (Chlorine, Chlorine dioxide, Calcium hypochlorite, Sodium hypochlorite) will always be used as the first option. When they are not available, they may be used, with prior authorization for use by the competent health authority

• Temporary use, never more than 50 days per year, while it is not possible to use previous disinfectants (Chlorine, Chlorine dioxide, Calcium hypochlorite, Sodium hypochlorite).

It is clear, then, that at least in Spanish legislation, the use of trichlor in the disinfection of drinking water is restricted, recommending the use of other chlorine compounds (chlorine, chlorine dioxide, calcium hypochlorite, sodium hypochlorite)"