What is the usual order for tank mixing when filling a spray tank?

The usual order for tank mixing when filling a spray tank is essential for ensuring that all components mix thoroughly and effectively without causing any unwanted reactions or clumping. This makes choice B the correct answer, as it outlines a systematic approach to achieving the best mixture.

Starting with compatibility agents is critical because they help ensure that the various products to be mixed do not react negatively with each other or precipitate out of solution. Following with suspension products allows for uniform distribution of solid particles in the liquid. Adding solution products next is important to maintain clarity and avoid any unwanted interactions with solid particles. Surfactants play a vital role in reducing surface tension to enhance the spread and wetting of the mixture on the target surface, and they should be added after the primary components to ensure they can efficiently interact with the mixture. Lastly, emulsifiers are included to stabilize the mixture if oil and water components are present, helping to keep the solution homogenous.

This sequential method is designed to prevent clumping and ensure that all ingredients are adequately mixed, which is essential for effective pest control application. In contrast, simply adding all products at once would likely lead to ineffective mixing, clumping, and possible product degradation, which can compromise the effectiveness of pest control treatments.