Topic
Water Filtration
Water Filtration is a recurring research topic on Health Canon. This hub collects related explainers and protocols, newest first, each with evidence grades and practical decision frameworks.
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Environmental Health
PFAS Removal: Reverse Osmosis vs Activated Carbon Filters
GAC handles many long-chain PFAS until breakthrough; RO is the more consistent barrier for short- and long-chain compounds when certified and maintained.
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Environmental Health
PFAS Forever Chemicals: Complete Guide to Exposure, Health Evidence & Mitigation
EPA drinking-water MCLs are now 4.0 ppt for PFOA and PFOS. Here is how forever chemicals enter the body, what half-lives and biomonitoring tiers mean, and which filters actually work.
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Environmental Health
NSF Water Filter Standards 42, 53, 58, and 401 Explained
Certification is claim-specific and model-specific: 42 is aesthetic, 53 health adsorption, 58 reverse osmosis, 401 emerging compounds.
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Environmental Health
Fluoride in Drinking Water: Evidence on Caries Benefits, Policy Levels & Contested Risks
U.S. systems that fluoridate target 0.7 mg/L. CDC still cites about 25% fewer cavities—while NTP reports moderate confidence that higher fluoride associates with lower child IQ. Dose is the whole debate.
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