Culligan Scout gravity system (2.25 gal) vs Waterdrop King Tank gravity filter (2.25 gal)

Only the Culligan Scout gravity system (2.25 gal) is certified to reduce PFAS, lead, chlorine and chloramine and 1 more. Verdict: the Culligan Scout gravity system (2.25 gal) for broader certified protection (5 vs 0 of the contaminants we track); the Waterdrop King Tank gravity filter (2.25 gal) if running cost matters more. Replacement filters and water for 2 people cost about $323 a year on the Culligan Scout gravity system (2.25 gal) and $3 on the Waterdrop King Tank gravity filter (2.25 gal); they cost $230 and $230 to buy.