Water cooled spindle, what coolant do you use

I have been looking on the web for a Tig welder to weld the aluminum gantry parts when I came across this link:

Coolant for TIG welding - WeldingWeb™ - Welding forum for pros and enthusiasts

They were discussing the water additives for a water cooled tig torch. There was a lot more to consider than I had
thought! I said to myself that many of the things mentioned in the posts were applicable to a water cooled spindle
coolant as well. So if you plan to use a water cooled spindle take a look at the URL and possibly save yourself
some headaches down the road.

I do not know why you cannot click on the URL above, but just cut and paste it into your browser.