Culligan Scout gravity system (2.25 gal) vs Waterdrop Countertop faucet filter CTF-01

Only the Culligan Scout gravity system (2.25 gal) is certified to reduce PFAS, lead, chloramine and microplastics. Verdict: the Culligan Scout gravity system (2.25 gal) for broader certified protection (5 vs 1 of the contaminants we track); the Waterdrop Countertop faucet filter CTF-01 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 $40 on the Waterdrop Countertop faucet filter CTF-01; they cost $230 and $80 to buy.