Slow sand filtration : recent developments in water treatment technology / editor N. J. D. Graham. — Chinchester : Ellis Horwood Limited, [1988]. — CIDIMA. — 412 p. : gráf. ; 25 cm. — ( Water and wastewater technology) ISBN 0-7458-0585-X (Ellis Horwood Limited) ISBN 0-470-21374-4 (Halted Press) 1. Tratamiento del agua.2. Filtración. I. Graham, N. J. D., ed.. 628.33