Causes of scale formation in solar water heater
1, the water is constantly heated, evaporated, concentrated, resulting in water calcium, magnesium, salt concentration increased, when exceeded their concentration, they precipitate out of water sediment;
2. The water is heated and the bicarbonate is heated down to produce insoluble deposits;
3, with the increase of temperature, the solubility of some salts gradually decreased and precipitated. Impurities in tap water and the fouling of the long - standing microorganisms used by solar energy. These sediments, impurities, dirt stuck to the vacuum tube wall, the formation of insoluble scale.