I used a water electrolyzer, left is my old distiller, middle is this one (vevor) right is my tap water. With a tds meter my old one had 1ppm, vevor 10ppm, and tap was 145-150. Purity is as good as my old one but at 10ppm is still better than spring water that runs around 50ppm. I may used an extra charcoal filter and run it a few more times in the hopes that it clears up.