I bought this distiller because my CPAP uses a lot of water and it seems that store bought distilled water is in very short supply. The instructions were pretty poor, but I was able to find instructional videos online. The unit is easy to use, and it takes about four hours to process a gallon of water. As people have mentioned in other reviews, if you let it go until the tank is empty, there is some rusty looking residue on the bottom. This is easily cleaned by putting a little bit of citric acid in with a bit of water and wiping the residue out with a cloth or sponge.The blue plastic collection bottle is pretty basic, and I decant the distilled water into gallon jugs that I saved from before.I love my distiller and highly recommend for people who use CPAPs or humidifiers.