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Around the world, household drinking water purification systems, including a reverse osmosis step, are commonly used for improving water for drinking and cooking.

Such systems typically include a number of steps:

• a sediment filter to trap particles, including rust and calcium carbonate
• optionally, a second sediment filter with smaller pores
• an activated carbon filter to trap organic chemicals and chlorine, which will attack and degrade thin film composite membrane reverse osmosis membranes
• a reverse osmosis filter, which is a thin film composite membrane (Thin Film Composite or Thin Film Membrane)
• optionally, a second carbon filter to capture those chemicals not removed by the reverse osmosis membrane
• optionally an ultraviolet lamp for sterilizing any microbes that may escape filtering by the reverse osmosis membrane
• For more Information: http://en.wikipedia.org/wiki/Reverse_osmosis