Hardness (TH) measures the calcium and magnesium content of water, i.e. the presence of lime in the water. A low hardness produces aggressive or soft water (corrosive to equipment). A high TH produces lime scale and is therefore hard water (which accumulates lime scale). The recommended TH parameter is between 150 and 300 ppm, the closer to 150 ppm the better to avoid corrosion or scale problems. It is recommended to measure this parameter once per season, at the spring tune-up.
Tips and Related Resources
The quality of CTX now available for spas
CTX® Pro launches SPA SENSATIONS, a complete range of specific products for residential spa treatment with innovative and user-friendly packaging.
Causes and treatments for cloudy pool water
Professional tips and solutions to treat cloudy pool water, as well as the main causes of this.
How to clean green pool water
If you have green pool water, discover our professional tips on what steps to take to resolve this problem.
How to clean pool limescale
If you have limescale in your pool, discover our professional tips on what steps to take to resolve this problem
Stinging eyes and smelly water in swimming poo...
If you have stinging or irritated eyes as a result of swimming pool water or smelly swimming pool water, you need to take a look at our professional tips to resolve these issues.
How to keep pool water clean
Professional tips to learn how to keep pool water clean and balanced throughout the year in just four steps. Find out more!
Tips for analysing pool water
Professional tips on how to analyse your pool water for it to be perfect all year round. Discover the tools available and find out what they do.