Photo 1 of Purewell PF-4 Ceramic 3-Stage Purification Elements, Washable & Reusable, NSF/ANSI 42&372 Certified, Replacement for ProOne®, Berkey®, Purewell® Filters and Water Filter Systems (2 Pack, K Series)

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Photo 1 of Purewell PF-4 Ceramic 3-Stage Purification Elements, Washable & Reusable, NSF/ANSI 42&372 Certified, Replacement for ProOne®, Berkey®, Purewell® Filters and Water Filter Systems (2 Pack, K Series)Photo 2 of Purewell PF-4 Ceramic 3-Stage Purification Elements, Washable & Reusable, NSF/ANSI 42&372 Certified, Replacement for ProOne®, Berkey®, Purewell® Filters and Water Filter Systems (2 Pack, K Series)