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Pulps. Standard tap water for drainability measurements. Conductivity 40 mS/m to 150 mS/m Ingestion-build-189776 Who is BS EN 15421 Scope This International Standard describes the specification and preparation of standard tap water, of conductivity between 40 mS m and 150 mS m, for drainability measurements. This International Standard is applicable to all kinds of pulps. NOTE ISO 14487[1] describes the specification and preparation of standard distilled deionized water.