Question: Why does a Reverse Osmosis system send water to the drain?

Answer:

There is a percentage of water from a RO system that goes to the drain. This water is carrying away the impurities. These particles are too small to be caught by filters. Our RO systems have an automatic shut-off valve that shuts off the flow of water to the drain when the storage tank is full. This ASO valve stops the RO system from continuously running water down the drain, thus conserving via the RO system working only according to usage.