Methodology
How every number on this site gets earned.
No hands-on lab can test every softener and filter sold in America. What a disciplined desk lab can do is verify, sources, dates, certifications, math, and then have the technical analysis read by an expert before it goes out. Here is the exact process behind every article.
Specs come from the manufacturer's own sheet
Grain capacity, flow rates, micron ratings, warranty terms, every spec we publish is read off the manufacturer's specification sheet or manual, not off a retailer listing or another review site. When two official sources disagree, we say so instead of picking a side.
Every price carries the date we checked it
Prices in this niche swing with promotions and shipping policies. We record the price on the seller's own page and stamp it, currently "Prices checked Aug 28, 2026", so you can judge freshness at a glance. An undated price is treated as no price at all.
Certifications are verified, not repeated
Claims like "NSF certified" are checked against the actual certification listings (NSF/ANSI 44 for softeners, 42/53 for filters, 58 for reverse osmosis) and WQA Gold Seal records. A marketing badge on a product page is not evidence; a listing in the certifier's database is.
We model 10 years of ownership, not day one
For every system we estimate the decade-long bill: purchase, typical installation, salt or media, replacement filters and membranes, and electricity where relevant. A cheap system with expensive cartridges loses to an expensive system with cheap upkeep, and the math shows it.
A water treatment expert reviews the technical analysis
The team researches and writes; Ray Calloway, a water treatment expert, reviews the technical substance of the articles that carry his name, sizing math, spec interpretation, certification claims and installation reality. If he disagrees with a recommendation, it changes or comes out.
Rankings are decided before commissions exist
Comparison tables are built from specs and costs first. Affiliate relationships are layered on afterwards, and plenty of products we recommend earn us nothing. Where we have a financial relationship, it's disclosed on the page.
Published pages get re-checked
Water treatment lineups change: models get discontinued, capacities get revised, prices move. We periodically re-verify published articles and stamp an updated date when anything material changes.
Who writes, and who reviews
The two jobs are separate, and the byline says which is which. The Home Water Lab Team researches and writes: documentation, dated prices, certification lookups, cost models. Ray Calloway, a water treatment expert, reviews the technical analysis: whether a system is sized correctly, whether a spec means what the article says it means, whether a certification claim matches the listing, and whether the installation described is realistic in a real house.
An article carries the line “Reviewed by Ray Calloway” only when that review has actually happened. On the pages where it is absent, the work stands on the team’s research alone, we would rather show you the difference than blur it. See who is behind this site.
The two protocols we never skip
Almost every mistake in this niche comes from the same two places: a price with no date, and a spec quoted out of its context. So both have a written procedure.
How a price gets on this page
- 01The price is read on the seller's own page, the manufacturer's store, or the retail listing that is genuinely the point of sale for that model. Aggregators, coupon sites and other review sites are never the source.
- 02We record the exact configuration behind the number: model, grain capacity or flow rate, and whether the price covers a bundle (tank, media, pre-filter, install kit). A softener price is meaningless without the size attached to it.
- 03The number is stamped with the day it was seen, and the site shows that date on the article itself, currently "Prices checked Aug 28, 2026".
- 04Promotional prices are labelled as promotional, with the list price alongside where the seller shows one, so a $400 discount doesn't quietly become the baseline.
- 05Shipping, taxes and installation are excluded from a quoted price unless the page says otherwise, they are handled separately in the cost of ownership model.
- 06Prices are never copied from one article to another. Each page's figure is re-read at its own check date, and an undated price is treated as no price at all.
How a spec gets verified
- 01The source is the manufacturer's spec sheet, installation manual or official product page, in that order of preference, with the PDF winning over the marketing page when they disagree.
- 02Units are normalised before anything is compared: grains of capacity, gallons per minute of service flow, microns of filtration, parts per million of contaminant. Two systems only appear in the same table when the numbers are genuinely comparable.
- 03Where a manufacturer gives a range or a condition ("up to 12 GPM", "at 20 psi drop"), the condition travels with the number into the article. A headline flow rate without its test condition is not a spec.
- 04Certification claims are checked in the certifier's own database, and we state what the listing actually covers. A product certified under NSF/ANSI 42 for chlorine and taste is not certified for lead, and we will not let the badge imply that it is.
- 05When two official documents contradict each other, we publish the contradiction rather than resolve it silently, no single figure gets carved in stone on the strength of a coin flip.
- 06Anything we cannot source to a document does not get printed. There is no house estimate standing in for a missing spec.
What we don’t do
A methodology is only worth reading if it admits its limits. These are ours, stated plainly so you can weigh what you read here against what you read elsewhere.
We don't run a testing laboratory
No hands-on lab can test every softener and filter sold in America, and we don't pretend to be one. We do not measure grain capacity, flow rate or contaminant reduction ourselves. What we do is verify what the makers and the certifiers have documented, and check the math on top of it.
We don't accept free or loaner equipment
No brand sends us a system in exchange for coverage, and no brand pays for a placement, a ranking or a review. The only money in this site is affiliate commission on links a reader chooses to click, disclosed on every page that carries them.
We don't award ourselves scores
No invented "lab score", no five-star rating we made up, no leaderboard built on a feeling. Rankings are argued from specs, dated prices and 10-year costs, and the reasoning is on the page so you can disagree with it.
We don't present estimates as measurements
A 10-year cost is a projection, and it is labelled as one, with its assumptions, salt use, filter intervals, local water hardness, written next to it. Change an assumption and the number changes; that's the point of showing it.
Spot an error?
Tell us and we’ll fix it and stamp the update, corrections are made on the page itself, not quietly. The about page has the fastest way to reach the lab.