A. O. Smith RO with Microbial Boost AO-US-RO-MB-4000 vs APEC ROES-50

Only the A. O. Smith RO with Microbial Boost AO-US-RO-MB-4000 is certified to reduce PFAS, lead, chlorine and chloramine and 7 more. Verdict: the A. O. Smith RO with Microbial Boost AO-US-RO-MB-4000 for broader certified protection (12 vs 1 of the contaminants we track); the APEC ROES-50 if running cost matters more. Replacement filters and water for 2 people cost about $270 a year on the A. O. Smith RO with Microbial Boost AO-US-RO-MB-4000 and $100 on the APEC ROES-50; they cost — and $231 to buy.