All groundwater contractors know iron bacteria when they see it. "We were doing a well rehabilitation on a problem well that couldn't have a pump in it longer than six months because it would get so seized up," says Steve Strong, global sales manager with Laval Underground Surveys in Fresno, California. Strong and his colleagues suspected iron bacteria was to blame, so they put a camera down the hole to get a better look. "It looked almost like a lava lamp of floating biofilm," Strong says. The side view of the camera showed an uncased granite well with what Strong describes as a "fluffy" coating of iron bacteria.
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