Low-layer contamination causes red tides and blue tides, as well as producing putrid odors.

By utilizing a nanobubble generator (100A/S, water flow rate 500L/min) and air, and installing the nanobubble generator, the number of benthic organisms dramatically increases, and many fish species begin to be observed. Furthermore, sludge that had accumulated to a depth of over 50cm disappeared, revealing sandy bottoms, and various seaweeds were also observed.

At a temple in Kyoto, significant effects were observed in a short period using only a relatively small unit (50A/L) and air (without an oxygen generator). Prior to implementation, the water was brown due to hypoxia, or dark green due to excessive algae proliferation.

Not only did the transparency improve, but the foul odor emitted by the algae also disappeared. Furthermore, as the water became clear, buried artifacts were discovered, which was an additional benefit.