Which of the following is a disadvantage of wettable powders that requires an additional process or equipment?

• A. Hazardous to applicator
• B. Requires mechanical agitation
• C. Difficult to mix
• D. May clog nozzles

Answer: (B)

Wettable powders are fine particles that need to stay dispersed in water. They tend to settle out quickly, so you must have mechanical agitation to keep a uniform suspension during mixing and throughout application. This added step and equipment—an agitator or recirculating setup—is the main disadvantage tied to WP formulations, because without it the spray becomes inconsistent and the product can separate or form clumps that clog equipment. Other issues like potential hazards, mixing difficulty, or nozzle clogging can happen in some cases, but they aren’t inherently tied to the need for ongoing agitation.