Most water filters use reverse osmosis (RO) to purify drinking water. Experts agree that there should be at least 4 cleaning steps starting with a sediment pre-filter that gets rid of the initial large particles, moving towards a carbon block pre-filter that removes chlorine to make the water taste better. No wonder chlorine. It needs to be removed so that it does not damage the RO membrane. This is followed by the RO membrane where the pressure forces water through the membrane and leaves the contamination behind.
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