A filter 30 feet (ft) long by 12 ft wide treats a flow of 4.4 million gallons per day (MGD). What is the filtration rate in gpm/ft2?1) 1.2 gpm/ft^2. 2) 81.8 gpm/ft^2.
3) 3,055.6 gpm/ft^2.
4) 8.5 gpm/ft^2.

(4) 8.5 gpm/ft²

Explanation:

Given;

length of the filter, L = 30 ft

width of the filter, w = 12 ft

the filtration rate, Q = 4.4 x 10⁶ GPD

Area of the filter; A = 30 ft x 12 ft = 360 ft²

The filtration rate in gallon per minutes (gpm) is calculated as;

The filtration rate in gallon per minutes per feet squared (gpm/ft²) is calculated as;

Therefore, the filtration rate in gpm/ft² is 8.5 gpm/ft²

81 is a composite number.