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 1. n. 1. A group of people identified as distinct from other groups because of supposed physical or genetic traits shared by the group.