What happens with Wettable Powders (WP)?

• A. They wear out pumps and nozzles
• B. They improve system cleanliness
• C. They never clog filters
• D. They require no agitation

Answer: (A)

Wettable powders are finely ground solids that form suspensions in water. Because the particles are abrasive, they can wear down moving parts in the spray system—like pumps, seals, and especially nozzles—as the suspension is pumped and sprayed. Over time this abrasion leads to reduced performance and more frequent maintenance or replacement of components, which is why wear on pumps and nozzles is the best description of what happens with wettable powders.

They do not improve system cleanliness; in fact, residues and fines can build up and contribute to plugging or dirty filters. They can clog filters if not handled properly. They certainly require agitation—without mixing, the solids settle out, causing inconsistent application and potential clogging, not a problem solved by not agitating.