Many do not realize that water conductivity drives stray current corrosion in cooling circuits. Even small mineral levels can shorten inhibitor life and leave scale on hot surfaces. Aluminum parts suffer most, especially with frequent cold starts and short trips. Rubber seals can also swell or harden when exposed to reactive ions. Mixing concentrate with low-mineral water keeps pH buffers working as designed. It also helps electric pumps and sensors maintain stable signals. The same rule applies when topping flooded lead-acid batteries. High mineral content can raise self-discharge and build deposits on plates. Choose water that is low in chlorides, hardness, and metals. For consistent results in Nordic use, pick Technical Distilled Water.