Coolant flush with tap water

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Originally Posted By: LOLVO
The flush is for 97 toyota land cruiser. The owner's manual does not mention the significance of using distilled water.

Mercedes specifically states to use "demineralized water" for antifreeze mix. The materials used in each system are the same.
 
It depends of the pH, alkalinity and hardness of the water you're using.

If the tap water you're using is not properly balanced it could hurt the system in a long term way.
 
That is fine if you are useing like a prestone reverse coolant flushing system! As long as you draint he block and the cooling system nothing wrong with hard water flush!
 
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