Calculators

pH Up

Adjustment inputs

Total alkalinity is treated as ppm as CaCO3.

Pool volume gal Product Current pH Target pH Water temperature Total alkalinity ppm Cyanuric acid ppm Label active ingredient % Display unit

Product note

Select the active ingredient from the product label.

Prefilled calculator link

Verify before applying a dose

Verify the reading, pool volume, and product concentration against the label. Follow label and site directions; for large corrections, dose in stages, circulate, and retest before adding more.

Estimated addition -

Enter readings to estimate a pH Up dose.

Read the pH Up guide.

Estimated pH -

Estimated TA -

TA increase - Review in Alkalinity Adjustment

Product basis -

How PoolKit estimates pH Up

PoolKit estimates the dry product amount needed to reach the target pH by modeling carbonate alkalinity, cyanurate alkalinity, water temperature, and the selected product's added alkalinity and carbonate carbon.

The estimate assumes full mixing, no immediate CO2 exchange with air, no borates or phosphates, and product purity matching the selected active ingredient. It is a planning estimate, not a replacement for staged dosing and retesting.

Sources: PubChem sodium carbonate, PubChem sodium bicarbonate, PubChem cyanuric acid, and carbonate/cyanurate acid-base equilibrium.

Relationship to alkalinity

Sodium carbonate raises pH and total alkalinity at the same time. If the field goal is only to move the TA reading, use the Alkalinity Adjustment calculator instead.

Field use

Large pH increases should be split into portions. Circulate, retest pH and total alkalinity, then decide whether the remaining calculated dose still fits the water.

Step	Formula	Value Used
Pool volume	`gallons x 3.785411784`	-
Temperature conversion	`(F - 32) x 5 / 9`	-
Product chemistry	`formula, molar mass, alkalinity equivalents`	-
Label active ingredient	`active ingredient percent / 100`	-
Current total alkalinity	`test reading as CaCO3`	-
CYA alkalinity	`estimated from pH and CYA chemistry`	-
Current carbonate alkalinity	`TA - CYA alkalinity - water alkalinity`	-
Starting carbonate carbon	`carbonate alkalinity / carbonate alpha`	-
Dose search	`solve product dose until model pH reaches target`	-
Product dose	`active compound dose / active fraction`	-
Added total alkalinity	`product moles x alkalinity equivalents`	-
Estimated pH	`solve TA = carbonate + CYA + OH - H`	-
Estimated total alkalinity	`current TA + added TA`	-

This calculator only covers products that raise pH. Use pH Down when acid is the intended correction.

If pH rise is driven by aeration or CO2 loss, dry product may not be the right correction.