A RO water filter makes use of Reverse Osmosis method, wherein the liquid is forcibly pushed through a semi-permeable membrane to remove heavy metals - such as arsenic, fluorides, mercury, nitrates and dissolved impure salts. Such purifiers are commonly used in houses and companies. Pros Water with high TDS value, ranging from 500 to 2000 ppm; The source is hard or borewell water; The price varies, depending on technology membranes and storage capacity.
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