Choice of what grade of water to use in a HHO generator: Rainwater, spring water and tap water all contain impurities. A typical analysis will show minerals, suspended solids and other contaminates contained in these varieties. These impurities will precipitate out of the water when subjected to electrolysis.
white race: people of european decent are all grouped together for simplicity(even though we all know of each others variations and tribes), includes skin types of thin brown, to yellow to very white(eye color and hair color has no significance).
Race. Definition. noun. (1) A group or population of humans categorized on the basis of various sets of heritable characteristics (such as color of skin, eyes, and hair). (2) A descent from a common heritage, ancestor, breed or stock. (3) A tribe or family of people sharing a common breed or lineage.