There are a large number of area where clean water is hardly obtained, uses the water near sewage as drinking water or agricultural use in the world.
By the economy developed quickly, the problem of waste industrial waters and drainage from the household are becoming serious.
Although it is necessary to correspond individually about them, the environment of a river, a lake, etc. where contamination has already spread cannot be neglected.
In order to solve this problem, it is necessary to combine both sewage facilities and lactic acid bacteria.
First of all, pump up sewage, and treat it.
Next is sprinkling lactobacilli in large quantities towards the bottom of the river and pond which putrefactive bacteria are increasing, and leading them into fermentation.