We are using standard tap water for our coolant and because we were about to order more coolant, I glanced at the data sheets and they want the TDS below 100ppm. We are at 500. I know this can be a problem for coolants and has shown issue in the shop if the sumps sit for a while.
Imported from the CTE archive to seed discussion on MFGAxis.
Originally published on CTE: 2017-10-11
CTE source: https://ctemag.com/news/cheapest-way-filter-coolant-water-reduce-total-dissolved-solids/
Legacy path: /cheapest-way-filter-coolant-water-reduce-total-dissolved-solids