In the standard tank-mix sequence, which step comes first?

• A. Filling the tank one-fifth to one-half full with carrier
• B. Adding compatibility agent
• C. Adding emulsion products
• D. Adding surfactants

Answer: (A)

Starting with some carrier in the tank sets up a base liquid for all the other ingredients to dilute into, which makes the whole tank-mix effective and safer. Filling about one-fifth to one-half full gives enough headspace for agitation and prevents splash or overflow, while providing a ready medium for uniform dispersion as you add the rest of the components.

If you were to add products like emulsion concentrates or powders first, they could cling to the tank walls, form concentrated pockets, or not disperse evenly, leading to poor mixing and potential incompatibilities. By having water in the tank from the start, compatibility agents, emulsifiable products, and surfactants can be distributed more uniformly as they are introduced and mixed, reducing the risk of separation or residue and helping the final spray behave consistently.