The ClearFlo and ClearFlo PLUS Systems reduce contamination in heat transfer fluid systems while minimizing downtime and maintenance costs. The ClearFlo System continuously filters heat transfer fluids, removing particles as small as 10 microns, without disrupting system operation. This improves efficiency, can triple the life of a heat transfer fluid pump and reduces the frequency of oil changes. In addition, the ClearFlo System reduces deterioration of rotating parts, including pump rotors, impellers, seals, valves and stems. The ClearFlo PLUS System filters the cool oil reservoir and removes particles as small as 1/10 micron to reduce fluid contamination and water build-up, minimizing the nuisance of shutdowns caused by water vapor pockets.