SECTION 3.9
Coolant Contamination and Cleanout

Contamination of the coolant can come from a variety of sources, such as hydraulic oil, lubricants, floor cleaners, microorganisms, and dissolved metals, all of which inevitably render the fluid ineffective and unusable. This is true even if reclamation or filtration systems exist that periodically circulate the fluid into "as new" condition.

Close control over fluid maintenance will reduce the need for fluid dumping, cleanout, and recharging, and it will improve broach performance and tool life. A proper cleanout procedure should be followed before the coolant is recharged. Properly conducted cleanouts will:

1. Lower system bacteria and fungus counts, reduce odor problems, and prevent the inoculation of fresh coolant with rancid or contaminated fluid.
2. Remove slime and solid buildup caused by hard water, tramp oil, and bacterial activity.
3. Reduce the need for additives, reduce blockage and clogging of pipes and nozzles, and prevent cross-contamination of different coolants, which may not be compatible.