■How much concentrate should be added in mL? The amount of concentrate needed is calculated as "desired volume × target concentration ÷ concentrate concentration." For example, to make 10L of a 200ppm solution with a 12% concentrate, you would need approximately 16.7mL (10,000mL × 200 ÷ 120,000), and for a 6% concentrate, about 33.3mL. ■Add water to make a total of 10L Add water to this concentrate to make a total of 10L. This is a rough estimate that does not consider the difference in specific gravity between the concentrate and water. ■What are the concentration guidelines for different uses? 1. Disinfection of cooking utensils and floors (norovirus prevention): Chlorine concentration of about 200ppm 2. Floors or items contaminated with vomit or feces: 0.1% (1,000ppm) 3. Disinfection after cleaning building water tanks: Disinfect with a solution containing effective chlorine of 50-100mg/L at least twice, and let it sit for more than 30 minutes after disinfection. ■Dilution factor for water tank disinfectant For example, to dilute a 12% concentrate to 100mg/L, the dilution factor would be 120,000 ÷ 100, which equals 1,200 times. This is the concentration of the solution used for disinfection and is different from the residual chlorine remaining in the water after filling. Please also check the product labels and the procedures of each facility for concentration and usage.

■Is it okay to prepare in advance? The diluted solution of chlorine-based disinfectants loses its effective concentration over time. It is basic practice not to prepare diluted solutions in advance, but to dilute only the necessary amount each time you use it and to use it all up. Both the diluted solution and the concentrated solution should not be placed in direct sunlight or in high-temperature areas. ■What should you check when diluting? 1. Concentration of the concentrated solution: Check the concentration of the product you are using on the label and follow the instructions for use and dosage. The concentration varies by product. 2. Temperature of the water: Do not use boiling water to dilute. 3. Labeling of the container: If you are using a PET bottle or similar, clearly indicate that it is a disinfectant along with the name of the chemical and its concentration to prevent accidental ingestion. 4. Age of the concentrated solution: The effective chlorine may decrease during storage, so when calculating based on the labeled concentration, it may actually be weaker. ■Consultation on capacity changes and dilution Our company also supports capacity changes and dilution of industrial chemicals. We supply sodium hypochlorite, including lightweight products in 15kg containers, and conduct inspections and cleaning of water tanks in buildings. Please feel free to consult with us first.