Water pressure in reverse osmosis water purifiers

Are you a wise and informed consumer? If yes, you will have complete knowledge about the product you are buying. The effect is further heightened in case of home consumer durable products like water purifiers. No matter whether you use a UV or a reverse osmosis water purification system what is of substance is if it is the right one for your home. So, before you buy one, take a sample of your tap water to the nearest lab and get it tested. Accordingly, buy only what is recommended. And choose a reputed brand only; you will not be sorry. It is because you can completely rely on such a brand for innovation, quality, and technology not to mention the purification effectiveness.

It is water pressure that is the key determinant of the purifying process in a reverse osmosis water purification system. Pressure required varies from one reverse osmosis water purification system to another. It depends on the concentration of the salt solution on the concentrate (reject) side of the RO membrane. Thin Film Composite (TFC or TFM) or Cellulose Triacetate (CTA) is the RO membrane used in RO home water purifiers. While CTA is chlorine tolerant, TFC can treat chlorine free water. In the latter case, use of carbon pre-filters for chlorine removal is a must otherwise your system will experience quick membrane plugging. While TFC rejects 98% of the contaminants, CTA rejects 93% on an average. TFC is less prone to organic fouling while CTA is more prone to it. Use of TFC in water purifiers of RO mechanism is more accepted.

As aforesaid, without water pressure, your RO water purifier cannot run. If the pressure is higher than the maximum specified (2.0 kg/cm2 ), use of a pressure reducing valve is recommended. Over 200 PSI is required for running a system at 1100 PPM on the concentrate side. Sea water purifiers require 800+ PSI given the 33,000+ PPM. Home systems generally run at 50-70 PSI.

The RO membrane in a reverse osmosis water purification system is subject to plugging; the microscopic pores of the membrane get plugged when salts of the hardness or other ions precipitate out on one side of the membrane. Besides, organic compounds can also plug the pores. The quality of water then decreases so is the flow. Hence the use of filter cartridges is highly recommended in a reverse osmosis water purification system.

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