Support answer · Calcium

What is calcium hardness increaser and what are the ideal levels for pools and spas?

From Maytronics support, updated 2026-08-11, rewritten for clarity.

The answer

What to know.

Calcium hardness increaser raises the calcium level in your pool water to help keep the water balanced and protect your pool surfaces and equipment.

Proper calcium levels help:

  • Prevent corrosion
  • Protect pool surfaces
  • Reduce scaling and cloudy water
  • Improve equipment performance
  • Maintain balanced water chemistry

Most pools should maintain calcium hardness between 200-400 ppm.

Most spas should maintain calcium hardness between 150-250 ppm.

Source: Maytronics support. Rewritten for clarity with the same steps; the videos and illustrations are Maytronics' own.

Still need help?

Talk to someone who knows Dolphins.