Our Promise

Anyone can publish a “best filter” list. Here is what iPhilter refuses to do — and what we do instead.

The Seven Rules

  1. We never say “removes 100% of X.” We say what’s certified, under which standard, and how much it actually reduces — with proof you can check yourself.
  2. “NSF tested” means nothing. We say “NSF certified,” or we say “the manufacturer claims this, but nobody certified it.” Tested-to-standards is marketing. Certification is checkable.
  3. We never say “your tap water is poisoning you.” We say “here’s how to find out what’s actually in your water.” Fear is not a diagnostic method.
  4. There is no “best water filter.” There’s only “best for your water.” We recommend by water condition and test result — never by popularity, never by who pays the biggest commission.
  5. No “experts say” without a name. We cite the agency, the document, and the year — or we don’t say it.
  6. If your water doesn’t need a filter, we tell you. We’d rather talk you out of a sale than sell you something useless.
  7. Steve vets every product pick personally. Twenty-five-plus years in water treatment. No bestseller lists, no pay-to-rank, no exceptions.

What the Numbers Mean

“NSF certified” isn’t one test — it’s a family of standards, and the number tells you what was actually proven:

  • NSF/ANSI 42 — Taste, odor, chlorine. Makes water nicer. Says nothing about health.
  • NSF/ANSI 53 — Health effects: lead, cysts, VOCs, mercury. The one that matters most — but always check which contaminants are listed for that exact model.
  • NSF/ANSI 58 — Reverse osmosis systems: fluoride, arsenic, nitrate, dissolved solids, and more.
  • NSF/ANSI 401 — Emerging contaminants: pharmaceuticals, BPA, and other unregulated trace chemicals.
  • NSF/ANSI 44 — Water softeners. Hardness, not health.
  • NSF/ANSI 55 — UV systems for microorganisms (Class A or B).
  • NSF/ANSI 62 — Distillers.
  • NSF/ANSI 372 — Lead content in the materials themselves (“lead-free”).

The fine print that matters: a certification covers only the contaminants listed for that exact model. “Certified to NSF/ANSI 53” doesn’t mean every contaminant under 53 — it means the ones on that product’s listing. Always read the listing. That’s the receipt. (WQA and IAPMO certify to these same NSF/ANSI standards — the standard number is what counts, not which lab’s logo is on it.)

How We Make Money

When you buy through a link on this site, we may earn a commission. It costs you nothing extra.

Here’s what it doesn’t do: it doesn’t pick the products. Steve picks the products — personally, after checking the certifications — and the commission never enters the room. If a product pays well but doesn’t meet the standard above, it doesn’t get recommended. If the best product for your water pays nothing, it still gets recommended.

We’d rather earn less and keep your trust than earn more and lose it.

That’s the promise. Hold us to it.