That's difficult to say. For most of us everything more than the price of distilled water and a biocide to make the same amount of coolant is already to much. Most users don't need a coolant that can be used with temperatures below 0° Celsius.
But if I have to pay 9.90 Euro for the Thermochill EC6 than I would be happy if I could buy a pre mix that performs the same for 7.90 Euro or less.![]()
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