I am installing a water cooled spindle and have been looking at various setups. It dawned on me I have a 1/2" water line running right over my 36"x36" machine. I am thinking about tapping into the 1/2" water line with a solenoid valve and running a feed and return line straight down to the spindle and just running softened cold water for cooling. I'd dump the return into a sink next to the cnc. No radiator, no sump, no pump. There's no need for glycol in a system. Anyone see an issue with this approach to cooling a spindle?