How we pick

Units we claim to have tested: zero

That number is here because it is the honest one, and because in this category the alternative is usually a claim nobody can check. Search for hot tub cover reviews and you will find roundups asserting rigorous testing of twenty covers, written by authors whose stated qualification is a horticulture certificate or teaching literature. We do not have a lab, we do not own these products, and we are not going to pretend otherwise.

The obvious question that raises is: then why would anyone trust this site? The answer is that everything we do publish is reproducible, and a test lab’s results are not. You can open every standard we cite, redo every calculation we show, and read every spec sheet we compiled. You cannot redo somebody else’s undocumented test.

Two more numbers that belong next to that first one, because zero is the good number for all three: sponsored placements accepted: zero. Free products accepted: zero. Nobody has paid to appear on this site and nobody has sent us anything.

What we actually do, for every pick

1. Compile the manufacturer’s published specifications from the product label, the spec sheet and the manual. Where a page states a figure that came from a manufacturer, it says so — "the maker states" rather than a claim in our own voice.
2. Check the claim against the relevant published standard. Water chemistry figures are checked against the CDC’s Model Aquatic Health Code and its hot tub guidance, which are free to read and specifically cover the vessel.
3. Do the arithmetic, and show it. Dose per gallon, cost per treatment, turnover time, filtration area per bather, heat loss. Where a page gives a formula instead of a number, that is deliberate: your electricity rate and tub volume are not ours.
4. Check current availability. A recommendation for a discontinued product is not a recommendation.
5. Read what owners consistently report, and label it as anecdotal when we use it. A pattern in owner reports is real information and it is not a test result, so we do not present it as one.

What we do not do

• We do not test these products. No lab, no owned units, no hours-of-testing claims.
• We do not accept free product, sponsorship or paid placement.
• We do not publish star ratings or review counts we did not collect.
• We do not emit Product, Review or AggregateRating structured data. Our scores are editorial judgments of published data, and marking them up as product ratings would misrepresent them to search engines.
• We do not invent prices. See below.
• We do not claim credentials. Nobody here is a certified pool operator, a chemist or a technician.

What the scores mean

Every roundup on this site scores its products across four to six criteria chosen for that category, and produces an overall figure out of ten. Those numbers are an editorial judgment of published specifications, catalog coverage, availability and cost, made against this page.

They are not measurements. They are not test results. They are our reading of documents you can read too, and the reason we publish a criteria breakdown next to each score rather than the score alone is so you can disagree with the weighting rather than having to take the number on faith.

How we handle prices

Prices on this site come from a live data layer or they do not appear at all. When no live price is available, the button says "Check price" rather than showing a number we cannot verify today. A stale price is worse than no price, because it looks like information.

Right now the live price layer is not switched on for this site, so every button reads "Check price on Amazon". That is not a bug and we are not going to fill the gap with remembered figures. When it comes online, prices will render with the date they were verified next to them.

For the same reason there are no ASINs in our product data yet. A product identifier has to come from a live lookup, and inventing one would be exactly the kind of plausible-looking fabrication this page exists to rule out. Products link through a tagged Amazon search until that changes.

How we cite things

Every numeric range on this site carries a citation at the point of use, linking to the primary source rather than to another site quoting it. For hot tub water chemistry that is overwhelmingly the CDC, for two reasons: it covers hot tubs specifically, and it is free, so you can check us without buying a standard.

Where an industry consensus standard is the correct reference for spa water, it is the water-quality standard for public pools and hot tubs. It is a paid ANSI standard, which is why we name it rather than pretending to quote it at length. And we specifically do not cite ANSI/APSP/ICC-5 for spa water, because its scope is residential inground swimming pools — an error published on at least one national retailer’s spa page, and one we are not going to repeat.

We never cite a source we have not opened. Where a figure could not be verified, the page says so rather than filling the gap.

How we handle being wrong

Errors get fixed in place, with a dated correction note added to the page when the error was substantive. We do not silently rewrite. The full policy is on our editorial policy, and if you have found something wrong, tell us — that is genuinely what the contact form is for.

Visible update dates change only when the substance of a page changes. A price refresh is not an update, and stamping every page with today’s date because the site redeployed would make the dates meaningless.

How we get paid

Affiliate commission, disclosed above the first link on every commercial page and again in the footer. Where the better answer is a retailer we earn nothing from — custom-fit spa covers being the clearest example — we say so on the page and link them anyway. The full version is on how we make money.

The scope of the site, as it stands

37 pages covering 62 products across five areas: water problems, chemicals, filters, covers and the maintenance routine that ties them together. Every page is written by Scooter M., and there is no editorial team behind that byline pretending to be larger than it is.

If you want the short version of all of the above: if you asked us how we know something, we should be able to answer with a document, a standard or a calculation you could repeat yourself. Where the honest answer is that we do not know, the page says we do not know.