If you see '50WP' on a container of dry product, what does it mean?

• A. The dry product weighs 50 pounds per gallon
• B. The dry product is 50 percent water
• C. The dry formulation is 75% active ingredient by weight
• D. The dry formulation contains 50% active ingredient by weight

Answer: (D)

The main idea is how formulation codes convey how much active ingredient is in the dry product. A label like this uses the number to show the percentage of active ingredient by weight in the dry formulation. WP stands for Wettable Powder, which is a dry powder that you mix with water to spray. So 50WP means the product is 50% active ingredient by weight—the other half is inert carrier and additives. It doesn’t indicate pounds per gallon or water content, and it isn’t a higher percentage like 75%. When you apply, you use a rate by weight of product per area, and that will translate to the amount of active ingredient used based on the 50% active content.