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Made with FDA approved materials Fits 20" Big Blue housings Uses Resintech SIR-900 (activated alumina) media Flow Rate: 0.5 gpm Capacity: 2500 gallons Made in the USA Fluoride reduction is flow and pH sensitive. Best results with this filter are obtained at a flow rate of 0.5 gpm and an influent pH of 5.5. Higher flow rates and higher or lower pH causes a significant loss of capacity.