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The water source in Hong Kong meets the standards set by the World Health Organization (WHO), but the water passes through aging building pipes and rooftop water tanks. Additionally, chlorination disinfection leaves residual chlorine, so the Water Supplies Department (WSD) officially recommends boiling or filtering the water before drinking. RO water purifiers (such as Philips ADD6910 or ADD6922) can remove 110 harmful substances that boiling cannot eliminate, including lead, microplastics, and dissolved chemicals.