In a full storage facility chlorination method using sodium hypochlorite, the hypochlorite should be poured into the tank when the water reaches a level of ________ deep.

• A. 4-5
• B. 1-3
• C. about 10
• D. 5-6

Answer: (B)

In a full storage facility chlorination setup with sodium hypochlorite, you want to introduce the chemical when the water depth is about 1–3 feet. This depth gives enough water volume for the hypochlorite to mix quickly and distribute evenly throughout the tank through normal circulation, ensuring a uniform chlorine residual. If you add when the tank is deeper, mixing becomes slower and you can end up with zones of under-chlorination. If the water is too shallow, there’s increased risk of splashing and insufficient contact for proper distribution.