You should wear a respirator when mixing soluble or wettable powders.

Wearing a respirator when mixing soluble or wettable powders is essential due to the potential for inhaling harmful pesticide particles. Soluble and wettable powders can release dust or aerosolized particles into the air during mixing, which could be harmful if inhaled. Respirators are specifically designed to filter out these particles, thereby protecting the respiratory system from exposure to hazardous substances. It is a critical safety measure in pest control practices to ensure that applicators do not suffer from adverse health effects associated with inhaling pesticide dusts. Therefore, it's important to prioritize safety by wearing appropriate protective gear like respirators in these situations.