Just filtered water here.
I am a long time user of water wetter in my race car, up till a few years ago. I am not sure what caused the ww to react the way it did, but I have seen many posts in the past 1.5yrs where ww did the same thing in watercooled computer systems.
Here is what I encouter with ww w/car and also read from other puter water abusers. There is some cemical reaction that caused the ww aditive to become like jelatin cloging the radiator. Almost looked like cottage cheeze, but a funky color. I don't know what causes it, but will never use it again because it overheated my racecar causing me to loose a winning race. Not to mention the cost of repairs. And seeing this happen in watercooled puter systems will keep me from using is in my puter system.
Maybe it was just a bad batch that reached less than 1% of the users of ww, but I'm not going to take my chance.
Can't comment on purple ice. Never used the stuff. But as far as corrosion goes, I think it will occur in most any inviroment. Limiting or decreasing the process of corrosion is one thing, keeping algy or other living organizms out of the system is another. Not inroducing o2 to a cooling system will take care of the algy problem. And as far as corrosion goes, I just keep a watchful eye on my system and do a major overhaul about once sometimes twice a year with quaterly inspections.
