Does Reverse Osmosis (RO) waste a lot of water?

It depends on what you mean by waste. A home RO unit uses water to clean itself and wash away impurities. It’s like a lot of other water-using appliances. We use water to wash clothes, to wash dishes, to wash cars, to flush toilets. A reverse osmosis unit uses more water in its operation than you actually consume., In terms of expense, it’s like a couple or three extra toilet flushes a day.