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What Is Reverse Osmosis?

In simple terms, reverse osmosis is the process of pushing water through a filter that traps the impurities ( bacteria, virus, organic & inorganic impurities and other contaminates ) on one side and allows the pure water to be obtained from the other side. More formally, it is the process of forcing a solvent (water) from a region of high solute concentration (impurities) through a Thin film composite (TFC) with a size pore of 0.0001 micron membranes to a region of low solute concentration by applying a pressure. The membrane here is semi permeable, meaning it allows the passage of solvent (water) but not of solute (impurities). The membranes used for reverse osmosis have no pores; the separation takes place in a dense polymer layer of only microscopic thickness. In most cases the membranes is designed to only allow water to pass through.

Reverse Osmosis Process

Reverse Osmosis (R.O) is one of the most convenient and economical methods of reducing unwanted contaminants in your drinking water. Reverse Osmosis is the process by which water molecules are forced, by water pressure, through a semi permeable membrane.


The RO advantage


Table to illustrate the benefits of Reverse Osmosis Over ordinary filtration products

Material element% removedMaterial element% removed
Barium97%Potassium92%
Bicarbonate94%Radium97%
Cadmium97%Selenium96%
Calcium97%Silicate85%
Chromate92%Silver92%
Copper97%Sodium97%
Detergents97%Strontium97%
Fluoride90%Sulphate97%
Lead97%PCBs97%
Magnesium97%Insecticides97%
Nickel97%Herbicides97%
Nitrates80%Total Removal95%


The AQUA HILL RO 11-stages purification process is as follows:
Stages Filtration Material Benefit
1 Pre-Filter Polypropylene Yarn Wound Removes visible impurities
2 Antiscalant Filter Silica phosphate Removes excess hardness & silica in raw water
3 Pre Carbon Cartridge Activated Carbon Removes excess chlorine and organic impurities
4 Sediment Filter Polypropylene melt blown Removes suspended particles
5 Reverse Osmosis Membrane Thin Film Composite (TFC) (0.0001micron) Reduces TDS, hardness, pesticides, heavy metals like arsenic, lead & fluoride. mercury removes micro organisms like bacteria, virus and protozoa cysts
6, 7, 8 & 9 4-in-1 Mineral Filter Activated Carbon, Mineral Stones Bio-Mineral & Natural Stones It adds natural taste and essential minerals to keep water fresh and pure for drinking
10 TDS Control PVC Control Valve Maintain natural minerals in the purified water which is necessary to our body
11 Ultra Violet (UV) Aluminum & Quarts Glass with Phillips Lamp Totally kills remaining bacteria & viruses