https://www.amazon.com/dp/B000PS9XMI/
- Keep your spa water balanced by making sure it is within the following recommended ranges: pH 7.2-7.8, total alkalinity 80-120 ppm and calcium hardness 150-400 ppm
- Available for chlorine and bromine sanitizing systems
- For more than 25 years, Leisure Time has been the premier name in spa water care
- Leisure time chlorine test strips
- 50 strips per pack
- Fast and simple
- It is very accurate
- Compatible with chlorine and ozone sanitizers