Corrosion inhibitor package is added. Used coolant is filtered several times to remove suspended solids, and then passes through ion exchange beds that produce deionized water and ethylene impurities. Corrosion inhibitor package is added. Corrosion inhibitor package is added. Used coolant is passed through a 5 micron pre-filter and then through an ultra filtration filter which removes impurities as small as one half of one micron.
Corrosion inhibitor is added to restore balance.
Process includes filtering and adding chemicals to precipitate out certain dissolved solids. One system includes oxidation to aid in removing dissolved metal oxides and salts. One system also includes ion-exchange resin beds. The matrix is not intended as a complete list of manufacturers of antifreeze recycling equipment. The information was compiled by General Motors using data from respective equipment manufacturers.