A full and precise feed water analysis must be provided before a reverse osmosis system is designed. The water analysis report is meant to show the form and the concentration of all chemicals in the feed water. The chemicals consist of dissolved ions, silica, colloids, and organic (TOC). Specific groupings of anions and cations create sparingly soluble salts in the water and scaling of a reverse osmosis membrane may occur when the salts are concentrated within the reverse osmosis element beyond their solubility limit.
http://www.axeonwater.com/blog/the-first-phase-of-reverse-osmosis-systems-design-feed-water-analysis/
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