Even if you follow all the instructions, it will leak and you have to aim your container so that you get the purified water and not the tap. If you can't accept that like me, then you might try and fix it like I did. That's when the fun begins. Several times in my attempts to stop the leaking by tightening it the device popped off and water splashed in my face. It's doubly frustrating when you sit around and think about how easy it is for these dicks to make this product so that it will fit snugly on the faucet and not leak. This contraption costs about 30 dollars which isn't that cheap in my quarters. So I got it back to where it was to begin with but while I was trying to fix it I noticed how easy the whole thing comes off. So now I have to worry everytime that I use it that its gonna pop off and give me a scare.