A dishwasher mixes a chlorine sanitizing solution for the third sink. What concentration and conditions are correct?
a.200 ppm chlorine, water 110 to 120°F, contact time 30 seconds
b.500 ppm chlorine, water 35 to 40°F, and a full 60 seconds of contact time
c.10 ppm chlorine, water at any temperature, read on a quat test strip
d.50 to 100 ppm chlorine, water 55 to 100°F, contact time about 7 seconds
Explanation
A chlorine sanitizing solution should be roughly 50 to 100 ppm, with water between 55 and 100°F and at least about 7 seconds of contact, and it is verified with chlorine test strips. 10 ppm is far too weak to sanitize, and quat strips do not read chlorine at all. 200 ppm and 500 ppm are above the range for a food-contact rinse, leaving corrosive residue, and water near 40°F slows chlorine's action badly no matter how long the contact runs. Only the 50 to 100 ppm combination sits inside all three windows at once.
Law Reference: FDA Food Code §4-501.114Practice all 500 questions free — no signup required.
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