Whole house water filter guides
Everything you need to choose, install, and live with a whole-house water filter. Start with the best water filters of 2026 if you're short on time.
Best water filters by need
Head-to-head comparisons
Buying & ownership advice
How to Choose a Whole House Water Filter: The 5-Step Framework
A 5-step framework for choosing a whole house water filter: test your water, size flow rate, read certifications, pick tank vs cartridge, compare 5-year costs.
ContaminantsPFAS Forever Chemicals in Water: Which Whole House Filters Actually Help
What PFAS, PFOA, and PFOS are, why they matter, and which whole house filters have certified PFAS reduction — per maker specs and certifications.
Well WaterWell Water Filtration Guide: Iron, Manganese, and Sulfur Smell
Why well water needs different filtration than city water — iron, manganese, hydrogen sulfide, sediment — and which systems handle them, per maker specs.
MaintenanceHow Often to Change a Whole House Water Filter: The Real Schedule
Sediment cartridges every 3–6 months, carbon every 6–12 — but your water decides. The replacement schedule by media type, the signs you're overdue, and the gauge trick pros use.
ContaminantsWhole House Water Filters That Remove Fluoride: What Actually Works
Standard carbon won't touch fluoride. The three technologies that do — activated alumina, bone char, and RO — and which whole-house systems use them.
SizingWhat Size Whole House Water Filter Do I Need? The GPM Guide
Size by flow rate, not house size. The GPM chart by bathrooms, how to estimate peak demand, why port size matters, and the 20% headroom rule.
Cost & value
How filtration works
Salt-Free Softener vs Water Filter: What Each One Actually Does
Filters remove contaminants; softeners address hardness. What 'salt-free softener' really means, how TAC conditioning works, and when you need both.
ExplainerDoes a Whole House Water Filter Soften Water? The Honest Answer
No — filters and softeners do different jobs. What each one removes, why 'salt-free softener' is a misnomer, and when your home needs both.