Abstract: In one embodiment, a system for cleaning a well includes (i) an ultraviolet (UV) light emitting device and/or (ii) a first brush connected with an abrasion device motor to drive the first brush in rotation around a longitudinal axis of the first brush. A cable reel and a cable are connected with (i) the UV light emitting device to power the UV light emitting device, to lower the UV light emitting device into the well, and to raise the UV light emitting device from the well; and/or (ii) the first brush and the abrasion device motor, to power the abrasion device motor, to lower the first brush and the abrasion device motor into the well, and to raise the first brush and the abrasion device motor from the well.

Abstract: In one embodiment, a flotation apparatus for treating a liquid medium includes a flotation body; one or more UV lamps connected to the flotation body to be submerged in the liquid medium from the flotation body; and a filter screen connected to the flotation body to be submerged in the liquid medium upstream of the one or more UV lamps. The filter screen extends downward below a surface of the liquid medium to a lowest level which is disposed at or below a lowest level of the one or more UV lamps.