When intermittent water smell, which occurs only in certain periods, the method used charcoal filter would not be economical. While that may be deodorized by coal powder dose not exceeding 12mg / l. Can use 5 ÷ 7 mg / l for at mixing tank, the remaining less than 5 mg / l for the immediately preceding filter to avoid filtration cycle shortened due to the coal powder. The volume of activated charcoal taken from 0.06 ÷ 0,12m3 for 1m3 of water for 1 hour.
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