Disolved oxygen (DO) in water should be
(A) 400 to 800 ppm
(B) 4000 to 8000 ppm
(C) 0.4 to 0.5 ppm
(D) 4 to 5 ppm
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Disolved oxygen (DO) in water should be
(A) 400 to 800 ppm
(B) 4000 to 8000 ppm
(C) 0.4 to 0.5 ppm
(D) 4 to 5 ppm
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