What is the term for the water that exits the RO system?

The term for the water that exits the reverse osmosis (RO) system is referred to as product water. This water has undergone the filtration and purification process through the semi-permeable membrane of the RO system, resulting in a solution that is significantly lower in contaminants compared to the input feed water. The goal of an RO system is to provide high-quality purified water for various applications, and this purified water is what is designated as product water.

In contrast, the other terms mentioned refer to different components of the process. Feed water is the untreated water that is introduced into the RO system for processing. Waste water, often referred to in the context of the brine or concentrate, is the portion that does not pass through the membrane, containing the rejected contaminants. Brine specifically refers to the concentrated solution of salts and other contaminants that are expelled from the RO system. Understanding these distinctions is essential for comprehending the operational principles of reverse osmosis and the quality of water produced through this technology.