How much phosphate is required to provide expected results?
The most effective dosage rate is determined by running a complete water analysis to determine the total demand of the finished water and the consumption rate of the distribution system. The ANSI/NSF Standard #60 authorized listing of all certified drinking water treatment chemicals has limited the application of inorganic phosphates at 10 mg/L as total phosphate ion. In most cases, this is not a health related or safety limitation, but a practical guideline for the maximum required quantity of phosphate typically applied in drinking water. Most ground and surface water supplies contain naturally occurring phosphate at low levels. However, additional phosphate chemicals (1-5 mg/L) are added to control most Fe/Mn, scale or corrosion concerns. There are 20 distinct phosphate species listed by ANSI/NSF Standard #60 for use in drinking water with many more proprietary phosphate blends available on the market. Carus Corporation is a leading manufacturer of 29 types of generic and blended ph
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