Formula Selection
Purpose
This page explains how WaterBalanceTools selects the mathematical formulas used in its calculators and why industry-standard equations are preferred.
Preference for Industry-Standard Equations
WaterBalanceTools uses the same equations used by professional pool operators and certified pool technicians. These include the Langelier Saturation Index formula as defined by PHTA/ANSI standards, chlorine dosage calculations consistent with Taylor Technologies training materials, and volume formulas consistent with geometric standards.
Why Standard Equations Are Preferred
Standard equations produce results consistent with professional testing, allow users to verify results against commercial test kits and operator guidance, and have a documented history of real-world application. Novel or experimental equations are not used unless they have been formally adopted by a recognized standards body.
How Units Are Normalized
All calculations are performed in US customary units (gallons, °F, oz, fl oz) by default, with metric equivalents provided where specified. Unit conversions use the canonical factors in data/datasets/conversion-factors.json. All conversion factors have a single source of truth and are never duplicated in calculator logic.
Formula Versioning
Every formula used on the platform is assigned a version number and tracked in data/trust/formulas.json. When an authoritative source updates an equation, a new formula version is created. Calculators reference formula versions in their trust panels, enabling users to identify which version produced a given result.
Formula Review
Formulas are reviewed when: (1) a new edition of a reference standard is published, (2) new scientific literature provides evidence that a more accurate equation is available, or (3) the annual review date is reached. Changes are logged in the revision history.