To clear the air
first. Open the valve until the numbers 2,3 discharge sewage into it. It takes about 10 minutes and then close
the valve No. 2. 1,4 discharge sludge residues carried them out. It takes about two minutes, then turn off
the valve No. 3. 1,5 normal water filtration •. Open the valve 1 and 5 outside the closed valve.
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