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What is pool water quality testing? Sampling methods and test items [Basic knowledge]

The standards and the frequency of inspections differ between school pools and public pools. I will explain the locations for water sampling, the preparation of bottles, and the inspection items.

The water in pools is disinfected with chlorine to accommodate many people entering at the same time, and specific items are regularly tested. However, the standards followed differ depending on the type of pool. ■ Are the standards the same for school and public pools? School swimming pools are managed according to the "School Environmental Health Standards" set by the Ministry of Education, Culture, Sports, Science and Technology based on the School Health and Safety Act. For other swimming pools, the Ministry of Health, Labour and Welfare has provided "Hygiene Standards for Swimming Pools" for local governments, which they use as a reference to establish their own regulations. These hygiene standards for swimming pools do not apply to school pools. ■ What are the main testing items and standard values? The main water quality values are common to both standards. 1. Free residual chlorine: 0.4 mg/L or more (1.0 mg/L or less is desirable) 2. pH value: 5.8 or more and 8.6 or less 3. E. coli: Not detectable 4. General bacteria: 200 colonies or fewer per 1 mL 5. Potassium permanganate consumption: 12 mg/L or less 6. Turbidity: 2 degrees or less 7. Total trihalomethanes: 0.2 mg/L or less is desirable Please feel free to consult with us first.