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2 GPM of circulation to every square foot of surface offered in home plate pack. Distinction Between Main as well as Secondary Clarifier:. The very best way to assess the functional efficiency of a primary clarifier is to review the treatment efficiency for put on hold solids removal. If the clarifier shows erratic or irregular results, search for hydraulic loading boosts (determined as gallons each day each square foot; m3/day/m2). If the efficiency of removal for suspended solids does not average 40-50%, or FIGURE standards of 20-30%, over an extensive amount of time, search for disturbance in the container or various other operational deficiencies. A second clarifier is suggested to not just resolve the solids and also permit clear water to move over the dams, however it is likewise indicated to be a thickener.