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This document specifies a method for the determination of the sludge (bulk) density. The procedure to determine density of the liquid and of the solid fractions of a suspension is described in Annex C. This document is applicable to sludge suspensions from: - storm water handling; - urban wastewater collecting systems; - urban wastewater treatment plants; - treating industrial wastewater similar to urban wastewater [7]; - water supply treatment plants. This method is also applicable to sludge suspensions from other origin, provided the necessary verifications are done.