What is the typical characteristic of water produced by Reverse Osmosis?

Reverse osmosis (RO) is a water treatment process that effectively removes a wide range of contaminants from water, including dissolved solids, organic compounds, and various impurities. One of the primary outcomes of this filtration method is a significant reduction in biological oxygen demand (BOD) and chemical oxygen demand (COD) levels.

The low BOD/COD levels in water produced by reverse osmosis indicate that the treated water contains fewer organic materials and pollutants that can consume oxygen in a water body. This characteristic is essential for ensuring the water is clean and suitable for various uses, including drinking and industrial applications. The efficiency of RO membranes in separating contaminants leads to the production of high-quality water with minimal organic load, thus demonstrating why the correct answer highlights low BOD/COD levels as a defining feature of water treated through this method.

In contrast, higher BOD/COD levels would suggest a greater concentration of organic matter and potential pollutants in the water, which is not the case for water produced by reverse osmosis.