Introduce a flash/static ...

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Introduce a flash/static mixer near the Lime/CO2 injection site and relocate the Turbidity meter a sufficient distance downstream to allow Lime dissolution. Add prescribed dose of CO2 then Lime into acidic water for faster dissolution and hence lower Turbidity. Also use a bubble trap for Turbidity sample line in case turbulence/air entrainment from the static mixer has not achieved a laminar flow prior to Turbidity sample intake.