I have a 8,000 gallon Central Coolant System I use for grinding carbide rods and use a water soluble coolant. The Central System uses four Large sand filters that get back flushed to keep the coolant clean. I was told that you can only use synthetic coolants in the system due to the sand filters, this coolant system is 30 years old and works fine but I want to change to a coolant that is a semi-synthetic so the machines get some lubrication on the metal sliding covers, etc. Was synthetic coolant around thirty years ago? The coolant that I want has to work good on centerless grinding and keep my machines clean and not allow the cobalt to be leached from the carbide and no foaming. Can someone assist me with this problem.
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