What is a major environmental or safety concern when disposing of spent Class K residues?

• A. Chemical residues can be corrosive and should not be flushed into drains; follow disposal guidelines per local regulations.
• B. They are harmless and can be disposed with regular trash.
• C. They can be flushed down drains if diluted.
• D. They should be burned.

Answer: (B)

Disposal of spent Class K residues is about handling the leftover extinguishing agent in a way that minimizes environmental and public-safety risks. In many places, these residues, when uncontaminated, are considered non-hazardous enough to be disposed of with regular trash, so long as local regulations allow it. The important point is to avoid methods that could contaminate water or air, like flushing residues down drains or burning them, which are typically unsafe and restricted. Always check local disposal guidelines, but the idea behind the correct choice is that, under standard rules, small, inert residues can be disposed of with regular waste when permitted.