Diana Okafor
Home & Kitchen Product Reviewer
Diana has reviewed consumer home products for six years, with a focus on kitchen and water appliances. She tests every filter she writes about in her own home, tracking flow rate degradation, taste changes, and replacement filter costs over months, not days.
M.A. Journalism, Northwestern University. Previously reviewed home products for a national consumer publication. Certified Water Specialist (CWS) through the Water Quality Association.
Areas of Expertise
Articles
Best Countertop Water Filters (No Install) (2026)
We compared the best countertop water filters for renters and apartments. Countertop RO and gravity systems that need zero plumbing, ranked by cost per gallon.
June 10, 2026
Best Faucet Water Filters (2026)
We tested the best faucet water filter options against NSF lead certs, filter life, and cost per gallon. No-plumbing picks that switch between filtered and tap.
June 13, 2026
Best Filtered Water Bottles (2026)
We compared the best filtered water bottles by filter type, what each actually removes, and real cost per gallon. LifeStraw, Grayl, Clearly Filtered, Epic, and Brita.
June 17, 2026
Best Refrigerator Water Filters (2026)
We compare the best refrigerator water filter picks for 2026, including OEM Samsung, LG, and Whirlpool options plus genuinely NSF-certified aftermarket filters.
June 19, 2026
Best Water Filters for Arsenic Removal (2026)
We tested the best water filter for arsenic against NSF/ANSI 58 certification: RO and whole-house adsorption media that handle both As(III) and As(V).
June 21, 2026
Best Water Filters for Baby Formula (2026)
The best water filter for baby formula in 2026, ranked for lead and fluoride removal. RO and pitcher picks with NSF certs, filter life, and honest tradeoffs.
June 16, 2026
Best Water Filter Pitchers (2026)
We ranked the best water filter pitcher options against NSF 42, 53, and 401 certifications and cost per gallon. Brita, ZeroWater, Clearly Filtered, and more.
June 3, 2026
Brita vs PUR Water Filter Pitcher: Which Should You Buy? (2026)
Brita Elite vs PUR Plus pitcher comparison. We break down NSF certifications, filter life, cost per gallon, lead removal, and taste to help you pick the right one.
June 14, 2026
How to Choose a Water Filter (2026 Buyer's Guide)
Match the right water filter to your contaminants: pitcher, faucet, under-sink, RO, or whole house. NSF certs, cost of ownership, and when you don't need one.
June 15, 2026
How to Maintain Your Water Filter (Replacement Schedule Guide)
Water filter maintenance and replacement schedules for pitchers, faucet, under-sink, reverse osmosis, and whole-house systems, plus an annual cost breakdown.
June 12, 2026