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Finest Filters compatible external filter booster replacement foams suitable for both the Finest-Filters and APS filters. Finest Filters compatible external filter booster replacement foams suitable for both the Finest-Filters and APS filters. These sets are available in two different sizes. Please ensure the correct size is selected when ordering: Size: EF Booster Foams (Diameter = 105mm, Thickness = 35mm) OR Size: EF-2 Booster Foams (Diameter = 125mm, Thickness = 45mm) Regular replacement of the filter booster foams will ensure your filter is operating at its best.