Editorial policy

Our aim is simple: every number on this site should be something you can check.

Calculators

• Each calculator shows its formula and states its assumptions, such as product strengths and chemical constants, so you can see how a result was reached.
• Doses are calculated from the chemistry of each product (for example, the available chlorine in a product, or the molecular weight of baking soda), not copied from other charts.
• Before publishing, we test calculators against hand-worked examples, including the worked examples printed on each page.
• Where a result is an estimate, such as acid doses for pH, we say so and recommend adding part of the dose and retesting.

Guides

• We use AI writing tools to help research, outline and draft articles. A person reviews every article before it's published, checking calculations, comparing claims with reputable sources (such as the CDC, the US Department of Energy and manufacturers' manuals), and removing anything that can't be supported.
• Where we rely on a community guideline rather than an official standard, such as the free chlorine to stabilizer ratio, we say so and name the source.
• We don't invent personal experiences, testimonials or product tests. If we ever review a product hands-on, the article will say so and describe what was actually tested.
• Product labels and your equipment's manuals take priority over our general guidance, and our pages say so where it matters.

Corrections

If you find an error, email [email protected]. Substantive corrections are made promptly, and the page's "updated" date is changed to reflect them.

Independence

The site may earn money from advertising and, in the future, labeled affiliate links. Neither affects calculator logic or the conclusions in our guides.