For large ro/water use I.E. Water changes. I have 2 valves that stop it from going down the drain and open the other to fill 5 gallon drinking water bottles. Its not RO but it is already passed through the sediment and carbon filters of the RO/DI unit. That is what most of the under sink water filter kits you buy at Lowes and Home Depot ayway. So on my bi-weekily water changes, we get free drinking water to last a couple of weeks in our dispenser!!!