Filter Ledger is a source-linked foundation for buying the right water-filter replacement. Updated October 1, 2026.

Foundation | Records | Costs | Methodology | Disclosure | For agents | llms.txt

The product

Exact replacement fit, exact claim evidence, visible ownership-cost assumptions. This is a source-linked data service, not a review site claiming hands-on tests.

• Pilot coverage: 3 system records, 5 cartridge records, 2 claim records
• Money: $0 revenue. $0 external spend. Net profit not established.
• Delivery: Pilot data snapshot. No affiliate links, checkout or live database sync.

A model-specific record

• Brita Pacifica OB41 + Elite OB06. Brita’s January 2026 performance sheet names NSF International certification for lead reduction under NSF/ANSI 53. Manufacturer-reported here, not yet eligible for a public recommendation.
• 120 gallons / about 6 months. Manufacturer replacement guidance. Earlier replacement can be needed for hard water. This is not a guarantee for every contaminant or water supply.
• $32.99 for two filters. Observed Brita price. At the six-month replacement interval, that is $32.99 in annual refill cost only. Hardware, tax and shipping are unknown, not zero.

Brita price and product source

A real fit trap

Culligan says its new ZeroWater Technology cartridge does not fit older ZeroWater pitchers and dispensers. Generation is part of compatibility, not a footnote.

Manufacturer compatibility warning

The machine-readable contract

Exact pairs, source links, evidence status and publication eligibility travel with every record. Unknowns stay null. This snapshot is not a licensed certification feed.

{
  "claim_id": "c1",
  "system_id": "brita-ob41",
  "cartridge_id": "brita-ob06",
  "contaminant": "Lead",
  "standard": "NSF/ANSI 53",
  "certifier": "NSF International",
  "evidence_status": "manufacturer_reported",
  "source": "https://assets.ctfassets.net/bugnyha6so6z/5JK8pJvAg8UaTe0U6jsWnd/8b1d4448916af1778de2d6cd92533368/Elite_PT_Performance_Data_Sheet_Jan2026.pdf",
  "verification_link": "https://info.nsf.org/Certified/DWTU/Listings.asp?Company=06710",
  "eligible_public": false
}

Schema v0.1.0. The full dataset (schema 0.2.0) is on the For agents page.

Commercial gates

Source permission before launch. NSF’s website policy requires prior written permission for commercial copying and data extraction. No bulk registry data is included here. Rights for the intended verification workflow must be settled before commercial use.

Waterdrop publishes at least 8% commission. Aquasana publishes rates starting at 10% and a 30-day cookie. Neither application has been submitted. Agent attribution and recurring refill payouts are unproven.

Waterdrop published terms | Aquasana published terms

The first revenue milestone is one legitimate credited customer sale, not a projected order count. Then approved commission, refunds, expenses and cash receipts get tracked separately.

Read the methodology

Working name. No original testing, payment or affiliate enrollment. The $1,000 monthly profit target is a goal, not a forecast.