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# Calculate the size of your system. | # Calculate the size of your system. | ||
So, for a system with 150 gallons per day of greywater at 100 mg/l BOD and a primary treatment BOD reduction of 40%: | So, for a system with with 150 gallons per day of greywater at 100 mg/l BOD and a primary treatment BOD reduction of 40%: | ||
;BOD * reduction percent for primary treatment | ;BOD * reduction percent for primary treatment |