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Unless you are going to change your radiator and rebuild an engine it will be next to impossible to prevent the buildup of scale or remove the deposits from within your cooling system. Our cars are old, and even if we use distilled water we will still have the same issues as if we used tap water. Its like undercoating a car that has rust all over the bottom...if you dont remove the rust, the undercoating isnt really doing any good...now being able to get rid of all the scale and deposits within your cooling system, THEN using pure water would be best...but like I said, the only way of effectively doing that is w/ a new radiator and rebuild engine that has had its passages scrubbed clean!

^^In hot climates, such as the desert which gets 110+ and you're not moving fast on a highway (such as stuck in traffic) water will not suffice. For moderate temperatures where you are cruising, water is fine. Racing is another example of where water would not work on a hot day.

I heard of a guy who put an annode, cathode, homotron.. (Whatever gets worn away in this case), so that it would get eaten up in the electro chemical reaction, instead of his engine parts.

Look up "cathodic protection". Its basically a sacrificial anode. You introduce a metal which is more anodic than the material you want to preserve and it becomes the anode in the electrochemical cell forcing the good material to become the cathode.

I always get the cathode and anode confused...I hated chemistry. The anode gives up electrons...the cathode accepts them. The anode corrodes and the cathode is preserved. Force the rad to become the cathode and it won't corrode.

Anode, current flowing in. Cathode, current flowing out. Either can be positive or negative depending on the direction of current flow. Positive to negative or negative to positive. Boats have used a sacrifical metal for years to stop a motor from corroding. Read this and be confused. lol http://www.cathodicprotection101.com/" onclick="window.open(this.href);return false;