RO stands for Reverse Osmosis and is high-tech water purifying film developed in United States. RO is a filter which texture is very fine (0.0001 micron) and can get rid of dozens kinds of impurities in tap water and things which is said to conventionally unable to remove such as trihalomethane, dioxin and nano-heavy metals.
You can comfortably use it at home.
Effects on four types of water-purification system against substances
||Ion exchange membrane||Hollow-string membrane||Activated carbon|
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