Water balance calculator

Total alkalinity

Plan sodium-bicarbonate additions from product purity and tested alkalinity.

A pool water sample and testing kit beside clear blue pool and spa water

Measured inputs

Plan a staged increase

Use fresh test results and confirm every product value against its label.

Staged treatment plan

1,906 g full amount

Start with 953 g (33.6 oz), circulate as labeled, then retest.

Product effectsRaises total alkalinity; pH response varies and is not predicted here. Adds sodium and contributes to TDS.
Formula
CaCO3-equivalent demand × sodium-bicarbonate conversion ÷ purity
Assumptions
Sodium bicarbonate equivalent: 1.6787 g per gram of alkalinity expressed as CaCO3. 50% staged-dose planning factor; product label controls.
Source
Water-balance methodology · verified July 22, 2026

How to use this result

A planning quantity, not an instruction to pour.

1. Verify

Recheck volume, test reading, product strength, density or purity, and the selected target.

2. Read the label

Use the label’s application method, protective equipment, maximum dose, spacing, and re-entry directions.

3. Add separately

Never combine chemicals. Add one product at a time with circulation as directed.

4. Retest

Start with the staged amount, allow the label-directed circulation time, and measure again.