Facilities, Cleaning & PestsQuestion 486 of 500
A kitchen with very hard well water sets up a quaternary ammonium sanitizer. What limit does the Food Code place on the water?
a.Hardness of 100 mg/L or less, or as the label allows
b.Hardness of 250 mg/L or less, or as the label allows
c.Hardness of 500 mg/L or less, or as the label allows
d.Hardness of 750 mg/L or less, or as the label allows
Explanation
A quaternary ammonium solution must be used only in water with 500 mg/L hardness or less, or water no harder than the EPA-registered label allows, and at a minimum temperature of 75°F. Hard water ties up the active ingredient, so a test strip can read low even when the dilution was measured correctly.
Law Reference: FDA Food Code §4-501.114Practice all 500 questions free — no signup required.
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