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Does Reverse Osmosis Waste Water?

A reverse osmosis system sends water with rejected contaminants down the drain as wastewater, unlike other filters that trap contaminants. As water flows through the system, it's divided into two streams. One stream carries the filtered water to a dedicated faucet, and the other stream carries the removed salts, dissolved pollutants, and minerals to the drain.
The brine or "wastewater" carries rejected contaminants from a reverse osmosis system to the drain. 4 gallons of water exits the drain for every gallon of water produced. But the brine water is used for a purpose, so it's not exactly wasted. The wastewater in an RO system helps clean the water, just like a dishwasher uses water to clean dishes or a washing machine uses water to clean clothes. However, it's our job in caring for the environment to minimize the amount of water sent to the drain and increase the efficiency of the RO system.
How to reduce wastewater in an RO system
1. Add a permeate pump. Installing a permeate pump to a reverse osmosis system is the best way to increase its efficiency. Permeate pumps reduce the wastewater from an RO system by 75 to 80%. Not every reverse osmosis system is designed to use one, so make sure the one you choose is plumbed for an additional pump.  
2. Choose an RO system with an automatic shut off valve. An ASO valve stops the flow of water to the drain once the storage tank is full.
3. Use the RO reject water for landscaping or artificial lakes. Drain water has higher levels of total dissolved solids (TDS), but it's safe to use in your lawn or garden.

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