Special harsh waters. Winter Treatment without filtration. Suitable for closed installations throughout the winter. Choose and tuning the pool at the beginning of the season, because:- Prevents limestone deposits.- prevents the growth of algae and bacteria and does not spread. Station, with water in good condition and with a free chlorine content of less than 0.5 ppm, add to water, preferably at dusk between 3 and 5L./50 m³. The next morning leave the filtration equipment stopped. Repeat treatment after 3 months.Use biocides safely. Always read the label and information on the biocidal product before use. The product is authorised for general use.Candidate substances for authorisation under Regulation (EC) 1907/2006 (REACH): Not relevant.Substances included in Annex XIV of REACH (authorisation list) and expiry date: Not relevant.Regulation (EC) 1005/2009 on Substances that Deplete the Ozone Layer: Not RelevantActive substances which have been included in Article 95 of Regulation (EU) No 528/2012: N,N-dimethyl-2-hydroxypropyl ammonium chloride polymer (included for product type 2, 11).REGULATION (EU) No 649/2012 concerning the export and import of dangerous chemicals: Not relevant.