Pests & FacilitiesCâu 131 / 240
How should the concentration of a chlorine sanitizer solution be verified?
a.By smell alone
b.With chlorine test strips
c.By the color of the water
d.By tasting a drop
Giải thích
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.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
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