What range of ppm should sanitizer be set to?

• A. 50 to 100
• B. 100 to 200
• C. 400 to 600
• D. 200 to 400

Answer: (D)

Sanitizer effectiveness hinges on maintaining the right concentration for the product you’re using. For many store-focused sanitizers, especially quat-based ones used on food-contact surfaces, the target range is 200 to 400 ppm. Staying within this range ensures the sanitizer is strong enough to kill germs but not so strong that it leaves heavy residues or creates safety concerns. If the concentration is too low, germs aren’t reliably killed; if it’s too high, you risk residue, odor, and potential irritation, and you may exceed manufacturer guidelines. That’s why 200–400 ppm is the best fit among common options. Remember to measure with test strips and refresh the solution as instructed, allowing the required contact time for disinfection.