The original HotSpring test strips. 50 pieces in an air- and watertight container.
Benefit:
You measure 4 important values in 1 measurement.
1. Free chlorine > okay between 3 and 5 ppm
2. Alkalinity > okay between 80 and 120 ppm
3. PH > okay between 7.2 and 7.8
4. Hardness > okay between 25 and 150 ppm
