Installing 3 liebert challenger 3000 computer room units, water cooled, with a dry cooler located outside. We have a 2.5 " steel main with gruvlook fittings and all three branches are copper. So with that being said no cutting oil was used and the system was flushed with water only to get any debris out. Liebert suggested flushing system with a cleaner but had no suggestions. So any suggestions from anyone would be appreciated, keep one thing in mind, the cleaner has to be environmentally friendly. The place we are working at is so strict but at the same time i wont have to worry with disposing of it once i am finished.