What concentration of HTH is used for detconamination of the outside skin of the skip?

• A. 9% solution with 0.5% general purpose detergent
• B. 12% solution with 1% detergent
• C. 5% solution with no detergent
• D. 1% solution with 0.5% detergent

Answer: (A)

To effectively detonate and remove contaminants from the outside surface of the skip, you need a chlorine-based solution that’s strong enough to oxidize residues and a detergent to help the solution spread and lift grime. A 9% HTH solution with a small amount of general-purpose detergent (0.5%) provides the right balance: the chlorine level is high enough to tackle contaminants on a metal exterior, while the detergent lowers surface tension and emulsifies oils, ensuring thorough coverage and contact. The other options either use too little detergent, or a higher concentration that can be unnecessarily harsh for exterior skin, or a lower strength that wouldn’t adequately remove grime. This combination is the most effective for exterior decontamination.