
We have determined (in our opinion) that calcium hardness is the most misunderstood chemistry in the pool business.

If a source isn't readily available, the water will corrode through all sorts of equipment (like heaters and salt cells) looking for calcium. Calcium-deficient pool water gets aggressive and will steal calcium from anywhere it can find it. Water temperature getting colder seriously affects the balance and makes for more corrosive pool water. In much of the country, pools freeze.and even in warm places like Southern California, Arizona and Florida, water temperatures can dip below 50 degrees for several weeks at a time. Regardless of where you live, water gets colder in the winter time. Related: LSI Balance & Calcium Management (Pillar 1) We suggest testing for calcium out of the tap, during initial fill ups, and once a month or so after that.


It is remarkably consistent when left alone, and when coupled with good LSI management, calcium hardness helps water chemistry behave in a more predictable way. Good calcium hardness levels can make managing pool chemistry so much easier and cost effective. Until recently, calcium hardness and its importance water chemistry has been underestimated.
