Find local water treatment providers

Choosing

• Article · Water Quality Association

  WQA: At the Faucet Solutions (opens in a new tab)

  Explains point-of-use drinking water devices and which certifications to look for.

  Checked 2026-10-30

• Article · NSF

  NSF Certified Drinking Water Treatment Units Listing (opens in a new tab)

  Searchable database for checking whether a specific filter, RO or softener model is NSF-certified.

  Checked 2026-10-30

• Product · APEC Water Systems

  APEC Essence ROES-50 5-Stage Under-Sink RO (opens in a new tab)

  Long-running DIY tank-style RO for drinking water.

  Certifications WQA Gold Seal, NSF/ANSI 58: model ROES-50, claim TDS reduction only (34.8 GPD rated). Source: https://find.wqa.org/find-products/ctl/detail/mid/1054/cid/apec_water_systems/sid/5/keyword/roes-50 (opens in a new tab) (checked 2026-10-30). Home Depot's page says "No Certifications or Listings", and its broader "reduces" list (arsenic, PFAS, bacteria, etc.) is not certified.

  Checked 2026-10-30

• Product · Waterdrop

  Waterdrop G3P600 Tankless Under-Sink RO (opens in a new tab)

  Popular tankless RO; fast flow, smaller footprint.

  Certifications IAPMO R&T, NSF/ANSI 58-2021, file WC-13976: model WD-G3P600, claims TDS, fluoride, cadmium, hexavalent chromium and selenium. Source: https://mirobase.iapmo.org/pld/file_info.asp?file_no=0013976 (opens in a new tab) (listing "current as of 10/16/2026", read via search index; direct fetch returned a 500 error). REMOVED: NSF/ANSI 42 and 53 (not in the listing) and NSF 372 (only in brand docs, not confirmed in the listing). Not found in NSF's own DWTU listings.

  Checked 2026-10-30

Maintenance

• Product · HM Digital

  HM Digital TDS-3 Handheld TDS Meter (opens in a new tab)

  Pocket meter for spot-checking RO output and spotting salty or high-TDS water.

  Certifications None shown

  Checked 2026-10-30

• Product · APEC Water Systems

  APEC ESSENCE 50 GPD RO Membrane (MEM-ES-50) (opens in a new tab)

  Replacement membrane for the ROES-50; a good repeat-purchase item.

  Certifications No standalone certification. MEM-ES-50 is the listed replacement membrane in WQA's NSF/ANSI 58 listing for the ROES-50 system (same WQA source as ROES-50).

  Checked 2026-10-30