Machine Coolant Clean-out and Charge-up

The clean-out and charge-up procedure is broken down into four steps; beginning with the old fluid in the sump and ending with the new fluid in the sump.

Cleaning and Charging Equipment:

  • Long handled scrub brush Sump Sucker
  • Rubber Gloves Waste Fluid Container
  • Suitable Alkaline & Detergent Clean Refractometer

Kill Procedure

In order to guarantee a clean sump to start with, it is necessary to eliminate all bacterial and fungal growth present in the old system. This is done by treating the old coolant prior to removal. This treatment should be allowed to circulate throughout the system for 6-12 hours. [See product data sheets for dosage ratio]. Following treatment, the old fluid should be removed from the machine and transferred to an approved waste fluid container.


If you do not use a treatment to kill fungus and bacteria, you may choose to implement a residual cleaner only. In either event, after removing the old coolant, the machine must be cleaned. An effective clean-out consists of removing all chips, swarf and physical build up on the machine, as well as circulating a cleaner through the coolant system.

Chips, swarf and sludge should be vacuumed out after removing the coolant. A solution should be circulated through the coolant system, for a minimum of 30 minutes. While this is taking place, any machine surfaces not touched by the recirculating cleaner should be scrubbed by hand. The goal is to get the machine as clean as possible.


After removing any cleaner from the sump it is imperative that the machine be rinsed. Even a small amount of cleaner left behind in the system can destroy the coolant. The most effective way to rinse the machine is to fill the sump with a 2% solution of the new coolant and cycle it through the system, making sure it covers all machine surfaces. This should be cycled for about fifteen minutes.


After removing the rinse solution, it is important to charge the machine as soon as possible with the product recommended for this machine. The coolant should be pre-mixed to the desired concentration, and then added to the sump. This guarantees a homogeneous emulsion or solution, with minimal residue left on the machine tool.