FilterSpecs

FilterSpecs holds 31 product records, of which 5 have a published page. A record is published only once its certifications have been verified against the certifier's own database and it has a product image from a source we can name. The other 26 are held back rather than filled in.

How a figure gets onto a page

Every factual value on this site carries the source it came from and the date it was checked. A specification we cannot verify from a primary source is left empty and marked unverified; it is never estimated, inferred from a similar model, or carried across from a retailer's description.

Certifications are the point of the exercise. A certification is a listing in NSF's, WQA's or IAPMO's own database naming the model and the standard. A claim is a sentence on the packaging. Product pages show both, separately, and never let one stand in for the other.

We do not test products. We do not accept free samples, payment for inclusion, or manufacturer review of a page before it is published. The full commercial position is on how we make money; the short version is that we currently earn nothing from any link on this site.

What is in it

Under-sink reverse osmosis

Systems plumbed under a kitchen sink that push water through a reverse osmosis membrane. Certified reduction claims, replacement cartridge cost over five years, and the cabinet clearance each one needs.

5 published records

Contaminants

23 pages, one per contaminant that at least one published system is certified to reduce. Each lists the certified systems, the standard the certification was issued under, and what the certification does and does not cover. A contaminant with no certified system on file has no page, because a page with nothing on it states nothing.

• Arsenic
• Asbestos (fibers longer than 10 micrometers)
• Bacteria
• Barium
• Cadmium
• Free chlorine
• Chromium-3 (trivalent chromium)
• Chromium-6 (hexavalent chromium)
• Copper
• Cysts (Cryptosporidium, Giardia)
• Fluoride
• Lead
• Nitrate (as N)
• PFOA
• PFOS
• Pharmaceuticals and emerging contaminants
• Radium 226 and 228 combined
• Selenium
• Taste and odor
• Total dissolved solids
• Turbidity and sediment
• Virus
• Volatile organic compounds (VOC surrogate claim)

Findings

Claims about an entire subcategory rather than about one product. Each states the evidence that licenses its scope, because a claim about a whole category is only as good as the completeness of the search behind it.

• One company holds every certified well treatment product — Subcategory finding
• A salt-free conditioner cannot hold a listing for what it is sold to do — Subcategory finding
• NSF/ANSI 62 exists, and nothing holds it — Subcategory finding
• Certifier search gaps — Listings a certifier's own database holds and its own search will not return

Documents

• Methodology — How a score is produced, and when we refuse to produce one.
• How we make money — The full commercial disclosure.
• Certifier search gaps — Where a certifier's own search fails to return listings its database holds.
• Privacy — Every field the redirect logs, named.
• Terms — What this site is and is not.
• Contact — Corrections answered in public.