
Test strips make it easy and quick to check the basic parameters of pool water chemical treatment. The strips change color depending on the level of free chlorine, alkalinity, and pH of the water. One pack contains 50 strips. Store the strip container in a cool, dry place.
If the free chlorine level is lower than 0.5, additional chlorine should be added to the pool.
The pH value of water expresses the degree of acidity or alkalinity of a chemical substance. The ideal range for pools is 7.2 - 7.6. A pH higher than 7.6 leads to the formation of various mineral cloudiness, limescale, and other deposits. A pH lower than 7.2 causes corrosion of metal surfaces. The pH value affects the solubility and effectiveness of the disinfectants used.
The alkalinity of pool water should be in the range of 100 - 175 mg/l (g/m3) CaCO3. If the alkalinity is lower than 100 mg/l (g/m3) CaCO3, use CTX-21 to increase it. If the alkalinity is higher than 175 mg/l (g/m3) CaCO3, part of the pool water needs to be drained and replaced with water with low alkalinity.