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After collecting 1,000งข of the trial liquid in a 1,000งข beaker, shake it at 100~120 RPM, and add a small amount of PAC rapidly using a mess pipette.
Shake the mixture rapidly for 1-2 minutes.
When FLOC grows after shaking is slowed to 50-60 RPM for 10 minutes, stop shaking.
At this moment, investigate the size and sedimentation state of the FLOC, and measure its pH and residue turbidity using 100งข of the upper layer.
Do not forget to adjust the turbidity, the pH and the alkalinity before adding the PAC.
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