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texto impreso
Algae are commonly encountered in most surface water supplies. These organisms can affect water quality and challenge water treatment facilities. The new AWWA Manual M57, Algae: Source to Treatment includes detailed descriptions of hundreds of o[...]
documento electrónico
The purpose of these specifications is to provide a general basis for choosing and specifying underdrain gravel and filtering material for mechanical or rapid sand filters, and for placing such materials in the filter.
