The typical depth filter uses a down-flow approach with a media bed that holds solids at a rate of two to five pounds of solids per cubic foot. An alternative approach is a filter that uses a centrifugal force to “whirl” the untreated water towards the sand media. Under this method, the... >>
Ultraviolet is the part of the electromagnetic spectrum between visible light and X-rays. The specific portion of the UV spectrum between 185-400 nm (also known as UV-C) has a strong germicidal effect, with peak effectiveness at 265 nm. At these wavelengths UV kills microorganisms by penetrating... >>
Rainwater storage systems date back to the cisterns used in ancient Rome and probably beyond. They collected rain water in those days and still do in the Caribbean and elsewhere. The use of cisterns and atmospheric tanks with groundwater wells became more prevalent as pumps powered by the wind and... >>
