Do I have to add calcium to my spa?

  1. Most spa manufacturers recommend a Calcium Hardness (CH) level for your spa of 150-200 ppm. However, we recommend a slightly lower amount of between 100 – 125 ppm.
  2. Calcium Hardness is a measure of the total amount of dissolved calcium in the water. It is believed that calcium helps control the corrosive nature of water. Calcium has two major problems in Hot Water Chemistry: (1) it has a tendency to precipitate (fall out of suspension in high temperatures and (2) high pH will cause calcium to precipitate. The problem with calcium falling out of suspension is that it collects on the heater and pump, and shortens their life. A lower amount should reduce the potential for this occurring.
  3. Any natural corrosiveness in the water can be combatted by maintaining a slightly higher Total Alkalinity Level.
Post Type: faq