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Corrections

Formula changes should be visible, testable, and sourced.

Pool chemistry content has to be handled carefully. A typo in a formula, unit, product strength, or source note can change what a pool owner adds to the water. Corrections are treated as product fixes, not casual copy edits.

What gets corrected

  • Wrong formula constants, unit conversions, or product-strength assumptions.
  • Calculator bugs that change the result or hide an important warning.
  • Broken source links or source notes that no longer support the page.
  • Unsafe wording that could encourage mixing chemicals, overdosing, or skipping retesting.

How fixes are handled

  1. Reproduce the issue with the exact calculator inputs or source URL.
  2. Check the formula or wording against a public source, product label, or manufacturer document.
  3. Update the calculator, explanation, source note, and tests together when the math changes.
  4. Update the last-reviewed date when a formula or source record changes.

Material changes

Public calculator-method updates

Routine wording edits are not listed here. Changes that affect a formula, automatic target, safety boundary, or source attribution are recorded with the date, behavior, and verification path.

July 12, 2026 ยท CYA automatic-target boundary

The Pool Shock Calculator now auto-selects an FC planning target only for CYA values from 20-80 ppm, using the attributed Trouble Free Pool FC/CYA planning chart. Below 20 ppm or above 80 ppm, the calculator requires a target from the method, product label, or equipment guidance the pool owner is using. The prior automatic extrapolation above the published table was removed.

Verified with formula-library tests, calculator interaction tests, printed-result tests, and the constant-by-constant source record in the methodology page.

Review methodology Report an issue