Standard air conditioners remove some of the solid particles but allow water vapour in the air to pass freely. The RMF Air Conditioner deals effectively with both so reservoirs can breath clean, dry air. The uptake of moisture can be observed by the change in colour of the indicator granules in the Z-R gel. They turn from ruby-red (active) to a light orange (replace). The operation of the air filter can be monitored by an optional 'filter minder'. BENEFITS: Reducing water contamination level prolongs the life of the additive package and reduces oxidation of the oil and bearing surfaces.