Pests & Facilities第 131 / 240 题
How should the concentration of a chlorine sanitizer solution be verified?
a.With chlorine test strips
b.By smell alone
c.By tasting a drop
d.By the color of the water
解析
Sanitizer concentration must be checked with the correct test strips (chlorine test strips for a chlorine solution) to confirm it is within 50-100 ppm. Smell, color, or taste cannot measure ppm and are unsafe methods. Solutions should be tested regularly because they weaken with use and time.
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