Someone mentioned that since I didn't know about some water that's used in bottling companies and since I didn't know they said that I must have just crawled from under a rock. So I thought that I would mention something about transformers. As far as tap water that's all I used for years and I never had a problem with any of my car's cooling systems.I don't mean to be rude to you or anyone else but I get tired of the rude and disrespectful comments that are said to me. I may not have 2 or 3 car's , I may not have several projects going on but that doesn't mean that I don't have knowledge about car's. Maybe you guys are jealous that it might be possible that someone else knows as much or more than you guys do. I know that I'm not always right and I admit that.