Thank you for your valuable comment. Here, what is meanby gpm/ft2 ?

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Thank you for your valuable comment. Here, what is meanby gpm/ft2 ?

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gallons per minute per square foot, SI equivalence: 1 gpm/ft2 = (velocity) 0.1337 ft/min, thus we have 0.0407 m/min.  Good velocity for typical media will be 0.41 m/min.

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