Q-2, r. 4.1 - Clean Air Regulation

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175. Section 174 does not apply to an operator of a metallic surface treatment process that reduces surface tension of a solution containing hexavalent chromium so that the tension does not exceed
(1)  35 dynes per centimetre when the tension is measured with a tensiometer;
(2)  45 dynes per centimetre when the tension is measured with a stalagmometer.
The operator must measure that tension once a day for each vat used, and take 2 successive measurements at least 16 hours apart.
O.C. 501-2011, s. 175.