MDARD 3B Ornamental Pest Management Practice Exam

When using a hose-end proportioner, protecting the water supply from contamination is essential. A fail-safe backflow prevention device is required between the proportioner and the water source because pressure changes or siphoning can cause the pesticide solution to flow back into the drinking water line. This device acts as a barrier to prevent any contaminated water from entering the supply, safeguarding people and the water system. The other options don’t address this risk: drift control relates to where droplets land, not backflow; a filter tackles solids but doesn’t stop backflow; UV disinfection isn’t a standard requirement for this setup and doesn’t prevent backflow.