[16:20, 15/04/2024] RONALD KH: swimming pool CL 0.5, PH 7.8
[16:52, 15/04/2024] RONALD KH: before back wash 1.2, after back wash 0.8
[14:38, 20/06/2024] Edwin Chen 013: All OK? [14:45, 20/06/2024] Leung KH🍀: Okay [14:46, 20/06/2024] Leung KH🍀: 3,329ppm [14:46, 20/06/2024...
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