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When hardness level is too high, concentrate breaks from oil/water emulsion and floats on the fluid surface. It gets skimmed off like oil and can easily plug particle filters. |
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The rest is mostly water, providing insufficient lubrication and causes broken or prematurely worn tooling. |
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Rust preventative may be required since the natural lubricant of coolant is no longer part of the fluid pool. Machine interiors may also become affected. |
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Grease may form as chips interact with the concentrate. Grease is not easily skimmed and can plug filters. |
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Lack of minerals cause foam, which prevent oil skimming as the surface tension changes. Foam also encourages tank overflow. |