Welcome to the water biotechnology and microbiology laboratory (water-bio lab) at Kanazawa University. Our research group is developing an advanced water treatment technology using microbial functions for providing a safe and secure water environment to the world. However, the majority of microbes in water treatment are composed of dark matters. Thus, it is necessary to reveal the microbial ecosystem by accurately analysis and measurement, which are phylogeny, function, and quantity of key microbes in the water treatment. We are doing research not only to develop the water treatment technology but also to advance the microbial measurement technology and elucidate the microbial ecosystem in the water treatment.