01Gold Standard
Duo Shower Filter
$89.99$45/filter
showerchlorine-removalNSF-certified
Highest contaminant reduction in independent testing. Only shower filter with solid carbon block eliminating 100% chlorine AND disinfection byproducts (DBPs). NSF-certified for PFAS, microplastics.
Quality Score11/12
Purity
Evidence
Transparency
Value
Strong Evidence
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Ingredients & Purity
Solid carbon block (not granular). NSF-certified filtration media. Tool-free installation.
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Scientific Evidence
Third-party lab results published: 87% chlorine reduction for 8,000 gallons.
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Brand Transparency
Full lab reports on website. Clear filter lifespan (5-6 months).
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Value Assessment
$90 with ~$45 replacement filters. Worth premium over cheaper alternatives.
Why Not Alternatives?
Most shower filters only use KDF-55 which reduces but doesn't eliminate chlorine. Jolie is overpriced at $165 for basic media. Weddell publishes third-party lab results.