B-1.1, r. 3 - Safety Code

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407. The owner must take samples or cause them to be taken and have them analysed to determine the Legionella pneumophila concentration in CFU/L:
(1)  at the time of re-starting, after winterizing;
(2)  at least once every 30 days, during the operation period;
(3)  between 2 and 7 days, following the application of the decontamination procedure.
O.C. 454-2014, s. 4.