TRANSPARENT METHODOLOGY
Every exact model and bundle is normalized to the same evidence, hydraulic, maintenance, warranty and ownership fields. Unknown data stays unknown — it does not become a positive assumption.
WATERSCORE
Breadth and meaningful reduction of contaminants the exact system is designed to address.
Certified systems score differently from independent tests, manufacturer tests and unsupported claims.
Service/certified flow, peak flow, pressure considerations and bundle bottlenecks.
Equipment plus scheduled media, cartridges, salt, UV and stated service assumptions.
Frequency, complexity, homeowner effort and required professional service.
Filtration, true softening, conditioning, UV and specialty treatment fit.
Actual component coverage rather than headline marketing.
Plumbing size, drain, electricity, bypass and installation complexity.
Quality and accessibility of manuals, performance data and replacement information.
EVIDENCE RATING
LEVEL 1
Exact system independently certified for the specified contaminant reduction claim.
LEVEL 2
Third-party test data is available, but the complete system is not certified for that claim.
LEVEL 3
Published manufacturer testing supports the exact claim.
LEVEL 4
Marketing claim found; supporting exact-model test evidence has not been verified.
A certified housing, carbon media or valve does not automatically prove the complete installed system reduces PFAS, VOCs, lead or another contaminant.
YOUR FIT
System service flow is compared with the homeowner's calculated peak simultaneous demand plus desired headroom.
Systems are rewarded for addressing selected water concerns with the requested evidence level.
Maintenance, replacement interval, warranty, budget, salt preference and installation style change the recommendation.
FilterTier may earn commissions or partner fees in the future. Compensation is disclosed and is not an input to WaterScore, Your Fit, evidence ratings or ranking order.
FilterTierEvidence-first whole-home water treatment comparisons built around your water, your house and your priorities.
FilterTier provides independent comparison and educational information, not medical, plumbing, engineering or legal advice. Product claims, certifications, specifications, prices, warranties and availability can change; verify current details with the manufacturer and use water testing and a qualified professional when appropriate. Some outbound links may be affiliate/referral links, which may earn FilterTier compensation without changing the price you pay or the scoring methodology.
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