# Aquasana AQ-4100 Shower Filter

> NSF/ANSI 177 and NSF/ANSI 61 certified inline shower filter with KDF and coconut-shell carbon media. Attaches between the shower arm and your existing showerhead. ~$80-125/yr filter cost.

- Brand: [Aquasana](https://nontoxicnook.com/brands/aquasana)
- Category: Kitchen › Small Appliances › [Water Filters](https://nontoxicnook.com/products/category/kitchen-water-filters)
- Price tier: $$
- Canonical: https://nontoxicnook.com/products/aquasana-aq-4100-shower-filter

## Why we chose it

Dual certification (NSF/ANSI 177 for filtration performance and NSF/ANSI 61 for material safety) distinguishes the AQ-4100 from most shower filters that skip material safety certification. The KDF-55 and coconut-shell carbon combination removes chlorine, lead, mercury, and synthetic chemicals. Caveat: KDF does not reliably remove chloramine at shower flow rates, so residents of chloramine cities should choose the Second Shower Head instead.

## Certifications

- NSF/ANSI 177
- NSF/ANSI 61

## Specs

- filter-media: KDF-55, coconut-shell carbon
- certifications: NSF/ANSI 177, NSF/ANSI 61
- chloramine-removal: Partial (KDF, not NSF-certified for chloramine)
- filter-type: Inline (works with any existing showerhead)
- annual-filter-cost: $106-126/yr
- source:nsf-ansi-177: https://info.nsf.org/Certified/HomeImprovement/Listings.asp?TradeName=Aquasana
- image:source-url: https://www.amazon.com/dp/B0016BS9T6
- image:credit: Aquasana, via Amazon product listing

## Where to buy

- [Amazon](https://www.amazon.com/dp/B0016BS9T6)

Prices are deliberately omitted from this mirror — they go stale. Current prices and stock: https://nontoxicnook.com/products/aquasana-aq-4100-shower-filter

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