Reverse Osmosis

A reverse osmosis water filter system consists multiple stages of filters, usually in 3 groups, pre-filters, reverse osmosis filter, and post-filters.

When the source water enters the system, it goes through the stages one, two, and three, collectively known as the pre-filters, which is to remove large contaminants and protect the RO membrane from chemicals like chlorine and chloramines.

After the pre-filters, the water molecules are pressed through the reverse osmosis (RO) membrane. This semi-permeable membrane features tiny 0.0001 micron sized holes, equivalent to just 0.000000004 of an inch. This allows it to cost-effectively remove the longest list of water contaminants only possible with such technology, which is most commonly used for producing bottled Drinking Water.

The fifth and final stage of filtration utilizes a finer Granular Activated Carbon filter known as the post carbon filter. This provides a final polishing before the filtered water is delivered to the faucet.

The end result is bottled quality water. In addition to the cost savings and convenience, widespread use of in home filtration systems would reduce the impact of plastic bottles on the environment tremendously.