Under-sink filter · checked 16 Oct 2026
Waterdrop 6-stage Under Sink Ultrafiltration Stainless Steel Water…
Model WD-TST-UF · replacement parts WD-P1, WD-U2, WD-C3
Lead:not claimedPFAS:not claimed
Each claim, checked
What the brand says, what a certification listing shows for this model, and where each fact comes from. We read listings; we do not test products.
- Certified (listing checked)The certifier’s public listing shows this claim for this model.
- Brand says certifiedThe brand says certified; IAPMO’s listing does not show it. NSF can be checked by hand.
- Brand claim onlyThe brand claims it without citing a certification.
| Contaminant | Brand claim | Standard | Certifier | Confirmed? | Source, date checked |
|---|---|---|---|---|---|
| Chlorine | “6-Stage Ultrafiltration – 0.01μm UF membrane reduces chlorine, heavy metals, and retains minerals.” brand source | – | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
Filter changes, by the brand’s numbers
How often Waterdrop says to replace each part. Real filter life depends on how much water you use and what is in it.
| Part | Brand says replace every | Changes a year | Source, date checked |
|---|---|---|---|
| WD-P1 sediment (PP) filter | 6–8 months“WD-P1: 6-8 Months.” | 1.5–2 | brand sourcechecked 16 Oct 2026 |
| WD-U2 ultrafiltration filter | 12 months“WD-U2: 12 Months.” | 1 | brand sourcechecked 16 Oct 2026 |
| WD-C3 carbon filterThe brand gives more than one figure for this part. | 12–24 months“WD-C3: 12-24 Months.”24 months“Filter Lifespan WD-P1 - 6-8Months WD-U2 - 12Months WD-C3 - 24Months” | 1 every 1–2 years or 1 every 2 years | brand sourcechecked 16 Oct 2026brand sourcechecked 16 Oct 2026 |
Certification listings found
IAPMO · NSF/ANSI/CAN 372 · file W-13936
Qingdao Ecopure Filter Co. Ltd lists WD-TST-B, WD-TST-UF
Materials only (no reduction claim)
Open the listing · checked 16 Oct 2026
Check it yourself
NSF’s and WQA’s terms don’t allow automated lookups, so these links open their public listings for this model:
- NSF listing search: WD-TST-UF
- NSF listing search: Waterdrop
- WQA listing search: WD-TST-UF
- WQA listing search: Waterdrop
- IAPMO R&T listing directory