pH & Alkalinity Test Strips

For those who would like a definition of pH and an explanation of why testing for pH matters, take a look at one of our previous blog entries: “Testing for pH Levels and Why pH Matters“.

Since we have not, as of yet, posted a blog entry specifically about alkalinity, we figure we will take care of that matter right now by including a basic definition of alkalinity in this blog entry:

In a nutshell, alkalinity refers to water’s ability to resist sudden changes to its pH and to measure alkalinity we measure the amount of CaCO3 in the water. In nature CaCO3 typically comes from rocks and soil that water passes over in its travels.

Pool and spa owners will add CaCO3, sometimes referred to as “Alkalinity Increaser, to counteract the basic (high pH) nature of liquid chlorine and/or the acidic (low pH) nature of most chlorine tablets and sticks.

Since pH and alkalinity have such a close relationship, and it would make sense to measure one if you planned to measure the other, the makers of the WaterWorks brand of water quality test strips created the pH and Total Alkalinity Test Strip which measures both water quality parameters simultaneously and gives accurate, repeatable results in under 30 seconds.


  1. Dip 1 test strip into a water sample for 10 seconds, then remove.
  2. Immediately match pH color, then match alkalinity test pad color.

Detection Levels:

  • pH: 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0
  • Total Alkalinity: 0, 80, 120, 180, 240, 360 ppm (mg/L)