Support answer · Alkalinity
What is pool alkalinity increaser, and when should I use it?
Short answer: Pool alkalinity increaser raises low alkalinity, usually with sodium bicarbonate, which can also raise pH slightly.
Based on Maytronics support, updated 2026-08-11, rewritten by Poolbots' pool experts.
The answer
What to know.
Alkalinity increaser raises the alkalinity of pool water when it is too low. The active ingredient in most formulas is sodium bicarbonate, also known as baking soda.
When to use it
You may need alkalinity increaser to correct low alkalinity:
- Following heavy rainfall
- After draining water or refilling the pool
- After using acid to bring pH down
- As part of regular water balancing
How it affects pH
Alkalinity increaser can also cause pH to rise gradually. Sodium bicarbonate primarily raises alkalinity, with only a slight increase in pH.
Source: Maytronics support. Same steps and facts, rewritten for clarity; the videos and illustrations are Maytronics' own.
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