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6 inch (FSS030): For ponds with a surface area of up to 200 sq ft, the recommended flow rate for optimum performance with the 6 inch Faceplate is 500 - 2000 gph.
8.5 inch(FSS035): For ponds with a surface area of up to 300 sq ft, the recommended flow rate for optimum performance with the 8.5 inch Faceplate is 1200 - 3000 gph.