When I have a totally clean system, charging with AC Fluid, gives me a nice clear coolant as evidenced by my GPU circuit. However, I think that AC Fluid may have its issues as others have reported the same. I will flush my CPU system again with another gallon of distilled H20 and we shall see what we shall see. One thing I may have to change is the air flow over my video card. The power mosfet sink and ram sinks get very hot. Perhaps a small 60mm fan would be about correct from my experiments so far.