What is the typical available chlorine percentage for HCH?

• A. 65%-70%
• B. 30%-40%
• C. 80%-90%
• D. 10%-20%

Answer: (A)

High-concentration chlorine products used for water disinfection are formulated to deliver a large amount of active chlorine in a small amount of chemical. The available chlorine percentage is the portion of the product that is effectively chlorine available for disinfection. For these concentrated forms, a typical strength is about two-thirds chlorine by weight, specifically around 65–70 percent. This level provides efficient dosing for treating water without resorting to large quantities. Lower percentages like 10–20% or 30–40% would require much more product to achieve the same disinfection, and extremely high strengths (80–90%) are uncommon due to handling and stability concerns. So, the typical available chlorine percentage for high-concentration hypochlorite is 65–70%.