Support answer · Calcium
When should I avoid calcium hardness increaser, and what can high or low levels cause?
Short answer: Avoid calcium increaser if calcium is above 400 ppm, scale is present, or pH or alkalinity is unbalanced; high or low calcium can damage your pool.
Based on Maytronics support, updated 2026-08-11, rewritten by Poolbots' pool experts.
The answer
What to know.
When not to add calcium hardness increaser
Do not add calcium hardness increaser if any of these apply:
- Your calcium level is higher than 400 ppm.
- Scale has already built up in your pool.
- Your pH or alkalinity is out of balance.
What low calcium can cause
Too little calcium can lead to:
- Etching and pitting of pool surfaces.
- Corrosion on metal components.
- Damage to your pump and heater.
- Poorly balanced pool water.
What high calcium can cause
Too much calcium can lead to:
- Water that looks cloudy.
- Buildup of scale deposits.
- Reduced circulation of pool water.
- Damage to pool equipment and surfaces.
Source: Maytronics support. Same steps and facts, rewritten for clarity; the videos and illustrations are Maytronics' own.
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