求翻譯：This Jar test is carried out with several beakers, usually we use 6 beakers. Then certain and different amounts of the coagulant is added usually, the addition of the chemical is in consecutive range, e.g. we add the coagulant agent in 35 ppm, 36 ppm, 37 ppm, 38 ppm, 39 ppm, 40 ppm (this is based on the estimated amo是什么意思？

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