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REVERSE OSMOSIS WATER PURIFIERS

 

Reverse Osmosis

Reverse osmosis is a process where water is passed under high pressure through a thin, semi permeable membrane. The water passes through the membrane while most chemicals and contaminants are washed away. The water produced by these systems is near pure and similar to distilled water in content.


Reverse Osmosis purifiers are regarded as the top of the range of water purifiers. They do however have their limits:

  • they are slow to produce pure water (around 3 - 9 litres per hour)
  • wastes a lot of water - for every litre of filtered water four or five litres go down the drain.
  • expensive to buy and run - the fragile membrane needs to be replaced regularly as it can become clogged or damaged and allow bacteria through.
  • reverse osmosis filters won't remove THMs and some are damaged by chlorine.
  • they are generally only used as under-sink installations, as they require a storage tank to hold the purified water. Bench top models are also possible and are most often installed in the laundry for convenience.

 

Main Benefits of Reverse Osmosis Purifiers

  • removing heavy metals - such as lead, nickel, cadmium, mercury, arsenic, etc occur due to corrosion of copper pipe fittings by acidic or 'aggressive' water. Other metals can be leached or washed into water supplies from industrial activities, although this is rare in well managed areas
  • removing minerals - natural minerals, including fluoride will not be removed by either carbon or KDF purifiers.

Next: Distiller Water Filters

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