The APU (air purification unit) Indicating Bottle contains blue Drierite® and charcoal that removes moisture and contaminants from the internal air flow of the trace instrument’s air lines. Drierite turns pink as it absorbs moisture. Replace bottle when all but the last ½’’ of the blue Drierite closest to the charcoal turns pink. This product has been precisely engineered, and both laboratory and field tested to critical standards for use on the IONSCAN® 400B instrument. The depleted APU plastic bottle can be recycled as part of any local recycling program once the contents (non-hazardous) are disposed.
