Photo 1 of iSpring F3US Standard Reverse Osmosis RO Systems 6-Month Prefilter Replacement Supply Cartridge Pack Set, 3 Filters w/Sediment, CTO and GAC, 10" X 2.5", Fits PH100, RO100, Made in USA

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Photo 1 of iSpring F3US Standard Reverse Osmosis RO Systems 6-Month Prefilter Replacement Supply Cartridge Pack Set, 3 Filters w/Sediment, CTO and GAC, 10" X 2.5", Fits PH100, RO100, Made in USA