| Source Water | Municipal tap water should comply with GB 5749-2022, China’s national drinking-water quality standard. | Most point-of-use dispensers are designed for treated municipal water; bottled-water models use sealed containers. | Obtain the latest local water-quality report and confirm whether the dispenser’s treatment capacity matches the incoming water. |
| Microbiological Safety | Under GB 5749-2022, total coliforms and Escherichia coli should not be detected in a 100 mL sample; total colony count has a limit of 100 CFU/mL. | UV, ultrafiltration, reverse osmosis, sealed bottles, and hygienic storage can reduce contamination risk, but none replaces regular cleaning. | Check tank sanitation, nozzle design, drainage, filter replacement records, and whether the hot and cold water paths are separated. |
| Turbidity | The standard limit for drinking water turbidity is generally 1 NTU under GB 5749-2022. | Sediment and carbon prefilters improve appearance and taste; ultrafiltration and RO usually provide stronger particle reduction. | Request test results from the complete dispenser system, not only from an individual filter cartridge. |
| Lead and Arsenic | GB 5749-2022 sets a maximum of 0.01 mg/L for lead and 0.01 mg/L for arsenic. | RO systems can substantially reduce many dissolved contaminants when correctly installed and maintained; carbon filtration mainly targets chlorine and organic compounds. | Verify contaminant-reduction test reports for the complete model and confirm the filter’s rated service life. |
| Nitrate and Fluoride | GB 5749-2022 lists a maximum of 20 mg/L for nitrate as nitrogen and 1.0 mg/L for fluoride. | RO is generally more suitable than carbon-only filtration when dissolved inorganic contaminants are a concern. | Use local water-test data to select the treatment method; do not assume every filter removes nitrate or fluoride. |
| Filtration Type | The treatment process should be selected according to source-water quality, required output, and maintenance capability. | Carbon: taste and chlorine; UF: particles and many microorganisms; RO: broad dissolved-contaminant reduction; UV: microbial inactivation without removing chemicals. | Prefer a staged system with clear replacement intervals and an automatic maintenance alert. |
| Hot-Water Safety | Hot-water outlets should include child protection, stable temperature control, over-temperature protection, and dry-heating protection. | Instant-heating and insulated-tank designs are both available; actual outlet temperature varies by design and flow rate. | Check anti-scald functions, lockable hot-water buttons, leakage protection, and temperature accuracy. |
| Electrical Safety | Applicable appliances should meet relevant Chinese electrical safety requirements, including GB 4706.1 and the applicable product-specific standard. | Common safety functions include grounding, over-current protection, thermal cut-off, and leakage protection. | Check the Chinese rating label, rated voltage, power, grounding requirements, and test documentation. |
| Materials in Contact with Water | Water-contact materials should comply with applicable Chinese food-contact and drinking-water-contact material requirements, including relevant GB 4806 series standards. | Typical materials include stainless steel, approved plastics, silicone seals, activated carbon, membrane materials, and filter media. | Request material declarations, migration-test reports, and documentation covering every wetted component. |
| Sanitary Approval or Filing | For products within the applicable scope of China’s drinking-water-related product supervision, verify the required sanitary approval, filing, or inspection documentation. | Documentation may cover the complete machine, filter elements, membranes, tanks, pipes, or other water-contact parts. | Confirm document validity, model number, applicable components, issuing authority, and consistency with the delivered product. |
| CCC and Product Certification | Check whether the specific electrical configuration falls within China Compulsory Certification requirements; voluntary certifications do not replace mandatory certification. | Certification status depends on product category, electrical design, and applicable catalogue requirements. | Match the certificate and test report to the exact model, rated power, plug configuration, and factory information. |
| Filter Replacement | Replacement intervals must follow the manufacturer’s rated capacity and actual water quality; time alone is not a sufficient indicator. | Typical service intervals range from several months to approximately one or two years, depending on filter type, usage, and water conditions. | Choose a unit with accessible filters, clear capacity ratings, genuine replacement availability, and automatic reminders. |
| Water Storage and Stagnation | Stored water should be protected from recontamination, excessive temperature, light exposure, and prolonged stagnation. | Tank-based dispensers may provide stable supply but require regular tank cleaning and sanitization. | Prefer sealed tanks, hygienic drainage, low-residual-water design, and documented cleaning procedures. |
| Daily Office Capacity | Select capacity based on peak demand rather than average daily consumption. | Small offices may require approximately 20–50 L/day; larger offices may need more than 50 L/day, depending on staff numbers and usage patterns. | Compare purified-water output, hot-water recovery, cold-water recovery, wastewater ratio for RO, and peak-hour performance. |
| Recommended Selection | The best option is the system that consistently produces compliant water and can be maintained correctly. | For treated municipal water, carbon plus UF may be sufficient; for higher dissolved-contaminant risk, a properly maintained RO system is usually more appropriate. | Prioritize verified water-quality results, sanitary documentation, electrical safety, maintenance support, and total operating cost over advertised features. |