I am in agreement with what you were prescribed in terms of water content, for the most part. Coolants with high water content can evaporate more quickly than synthetic coolant, causing the pollutants to dry on the cells. This ultimately leads to increased maintenance, and in some cases, malfunction. There are some electrostatic mist collectors available with patented technology that allows you to switch the voltage going to the cells, rendering optimal performance for each main type of coolant.

If your application allows, a small electrostatic unit direct-mounted would definitely be the best suited solution, in my opinion.  If you can use individual units, there’s less margin for error, compared to centrally ducted systems.  Most performance issues with ducted systems stem from improper air balancing and erroneous duct design.  For example, if you have multiple machines on a line, all connected to a central air cleaner, opening the cabinet on the one closest to the mist collector will negatively affect the capture velocity from the other machines in the line.  That said, it is of utmost importance to make sure that no detail is overlooked if you plan to duct multiple machines to a centralized mist collector.