This guide to “Editorial Policy and Source Standards” separates documented facts from details that only your exact filter and equipment can confirm.
Evidence hierarchy
Current manufacturer specifications and equipment manuals guide exact product or cabinet claims. Federal EPA material informs general filtration guidance. A retailer or filter maker’s published dimension is attributed to that maker’s own product.
Fit claims
We do not infer a cabinet fit from a nominal size. The research pack includes five manufacturer model references, but no verified Amazon offer, ASIN, or cross-brand substitution. Product cards remain absent until both fit and offer evidence are checked.
Corrections and updates
Sources were reviewed on 2026-11-04. Specifications can change. Send a correction, source URL, or model revision to vl-_-l@naver.com; we will review the claim against its primary document.
How a page is checked
For each size guide, we compare the nominal catalog entry with its named source and show its actual measurement only as that manufacturer’s example. For a model page, we retain the complete part number and the manufacturer reference instead of inferring a fit from rounded dimensions. We identify missing physical measurements and unverified retail offers rather than filling them with estimates.
Readers can examine the linked primary source on the page. If a source changes, we update the affected claim and its review date rather than silently carrying an old specification forward.