5th International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991

Section 2: Catchment Water Quality Regulation

Page 46

Improving Cistern Water Quality

J. Hari Krishna
University of the Virgin Islands, U.S.A.

Abstract

As cistern water systems become increasingly popular around the world, it is important that adequate attention be given to maintaining and improving cistern water quality. Periodic water testing, to at least determine the presence of coliforms, should be initiated in those areas where cistern water is used for drinking purposes. A number of relatively simple techniques are discussed in this paper, which will assist in improving cistern water quality. These include roof maintenance and removal of overhanging vegetation, installation of screens and first-flush devices, ultraviolet radiation, exposure to sunlight and the use of silver compounds in small quantities. The specific choice of a disinfection method depends upon the personnel and other resources available-in any given area or region.

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