Aquaguard-2 Water Bath Disinfection Solution Aquaguard-2 Solution is a highly active antimicrobial chemical compound which is effective against a wide range of both gram-positive and gram-negative bacteria including Pseudomonas aeruginosa. This bacterium is one of numerous opportunistic pathogens that often occur in very small densities passing through clean water-distribution systems. However, amplification may occur in static water areas and in sediment-laden water pipes especially during warm-water periods.1 What is most notable about Pseudomonas aeruginosa is that it is not only a highly relevant, important opportunistic pathogen and causative agent of emerging nosocomial infections, it is also known for its diverse bacterial mechanisms that contribute to its bacterial persistence. Pseudomonas aeruginosa has a predilection for growth in moist environments. Not surprisingly, this is probably a reflection that in its natural habitat as a gram-negative, motile, flagellated, free-living bacterium, it is found most commonly in soil and water. It has often been observed just "growing" in distilled water. This implication is suggestive of the fact with regard to its very minimal nutritional growth requirements. It does not even require organic growth factors. Moreover, due to the fact that it is one of many ubiquitous organisms in soil and water environments, what should concern us, in a laboratory setting, is the existence of something as apparently benign and omnipresent, is a chronic, moist-surface milieu as a water-bath. Such a situation should alert and remind us as to how important proper attention to maintenance, water quality and management as a high priority must be inculcated in our laboratory protocols regarding hygiene and sanitation.