These slimes can lead to increased corrosion of steel well casing, stainless steel well casing, stainless steel well screens, etc.
Nuisance bacteria are naturally present in groundwater.
Pumping a well increases the food supply for these bacteria, causing their population to rapidly expand in the vicinity of the well and in the distribution system. The bacteria form a slime or biofilm, that captures mineral scale and other deposits that move to the well during pumping. These deposits can reduce water quality, well yield, and well life expectancy. Many water users in the targeted area have had to repeatedly replace wells whose yield had deteriorated since original installation. Biofouling was suspected as being the cause of this deterioration.