The standard applies to the examination of bathing water with a cyanuric acid content of at least 1 mg/l. Note Cloudiness in the water can be dis urbing. The water should then be filtered through a filter with a pore diameter of 1.1 µm.1)
NEN 6493-1987 history
1987NEN 6493-1987 Water - Photometric determination of cyanuric acid content