... you can test the quality of various water in the following situations: water purification applications, wastewater regulation, aquaculture, hydroponics ... boilers & cooling towers, food processing, physics & chemistry teaching, water treatment, cosmetics, wine, home, office, travelling and more. ... 60 ppm: Pure Drinking Water 60-200 ppm: Tap Water 200-360 ppm: Washing Water above 360ppm: Polluted Wate ...