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There are four popular types of membranes used in water treatment:
- Reverse Osmosis for treating fresh water sources
- Reverse Osmosis for treating sea water sources often called desalination membranes
- NANO
- Ultra Filtration

1. Reverse Osmosis (RO) membranes are the most common and popular in use. Most are polymer based and will remove 98% of all dissolved solids (salts) present in the feed stream in a single pass. This removal percentage is called REJECTION. By taking the product water from one or a number of membranes called the first pass and putting that water through another membrane or group of membranes we create a two pass system which can remove well over 99% of the dissolved solids resulting in deionizer/distilled quality water. Product water is called PERMEATE.