Where should rinse solution from an old pesticide container be disposed of?

Disposing of rinse solution from an old pesticide container in a backpack sprayer or pesticide tank is a best practice known as "triple rinsing." This method helps ensure that any remaining pesticide residues are effectively utilized and do not enter the environment inappropriately. By adding the rinse solution to a sprayer or tank, you can dilute the remaining pesticide and properly apply it according to label instructions, ensuring minimal waste and compliance with safety regulations.

This method also aligns with environmental protection practices by preventing hazardous waste from contaminating landfills or water sources. It's crucial to follow label directions when mixing and applying pesticides, as this ensures safe use and compliance with regulatory guidelines. The other options could potentially lead to environmental harm, such as contamination of soil and water, or violate local regulations.