i ordered an american made Lan Shan Brand 3 stage RO filter from deutchland, and it came with no instructions. i got it set up and have a question.
on the bottom of the RO filter canister, there are 2 valves. one is just a hose and it trickles out and that is the pure water. the other has an on off valve and thats waste. when the valve on closed, wast water still comes out. why is this? when the valve is open, water rushes out like it's from the faucet. should the valve be open or closed? please explain this to me, and thank you.