C sample water softener with most because there are alloys of ลเชีซ Yom Yom both Ney and water-lined, for example, D is a value that does not have a water softener, because there are no alloys.
Water samples were the most C hardness, because there is เชีซ alloy, calcium, magnesium, potassium เซี่ยม and water samples D water no hardness without alloy.