Is the Weddell Duo shower filter NSF certified?

Last reviewed 2026-10-16.

Yes. NSF's NSF/ANSI 177 listing names the Weddell Duo (WD-100) from Weddell Water, with the WD-100F replacement filter, for free available chlorine reduction. The listing gives a 10,000-gallon service cycle.

Checked on 2026-10-16 in NSF International listing, NSF/ANSI 177 (https://info.nsf.org/Certified/DWTU/Listings.asp?Standard=177), which lists 7 makers and 11 products. Amazon offers read on 2026-10-16 for a US address.

NSF/ANSI 177 has one claim: free available chlorine reduction. A listing does not cover any other effect, and these pages make no other claim for any filter.

What the listing says

• Company: Weddell Water (Irvine, CA)
• Trade name on the listing: Weddell Duo (WD-100)
• Replacement element: WD-100F
• Service cycle: 10,000 gallons per WD-100F filter, at 2 gpm
• Claim: free available chlorine reduction

NSF lists the Weddell Duo in three colours: WD-100BL (black), WD-100WH (white), WD-100PN (pink). The replacement element is the WD-100F, with a service cycle of 10,000 gallons at 2 gpm.

The Amazon listing we link

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The Amazon listing's item model number, WD-100BL, is the black colour of the Weddell Duo (WD-100) on NSF's listing. This page links the black WD-100BL only. Model on the Amazon listing: WD-100BL (item model number and part number), colour Black. On 2026-10-16 it shipped from Amazon and was sold by WeddellWater. Weddell Duo (WD-100) on Amazon ↗

Prices are not shown; check the listing for the current price. A certification covers the listed model; another colour or a version under a different name needs its own check.

The other listed filter: Jolie Filtered Showerhead. All listed filters: NSF/ANSI 177 certified shower filters. What the standard covers: what NSF/ANSI 177 means.

We do not test filters — we index what accredited certifiers publish, with attribution, and make no health or treatment claims. A certification covers a specific model against a specific standard; it is not a general seal of quality. We are not affiliated with NSF International.

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