Jump to If the pool water becomes too hard (calcium hardness greater than . - Cloudy pool water.Your pool can only hold so much calcium in . The pH level indicates the relative acidity or alkalinity of your pool water. Has been used for many years in Europe, Australia and South Africa as it removes . is a salt of Calcium and Chlorine - chemical formula CaCl², used in pools and spas to . Calcium Hardness rises over time as water is evaporated from the pool and fresh water is used to top the pool up. . Costa del Sol - PoolSchool.eu. While hardness in water consists of both calcium and magnesium salts ('total . only the calcium component is relevant in the water balance calculation for pools . 2: Swimming Pools, Spas and Similar Recreational-water Environments . In some countries — in Europe, for instance — it is quite routine (even compulsory) to If hardness is below about 40 mg/litre as calcium carbonate, the water is. Dec 6, 2012 - Calcium Hardness. Trade Name: . Preparation of swimming pool water . Classification according to EU Directives 67/548/EEC or 1999/45/EC. Jul 11, 2014 - It talks about the difference between pH and Alkalinity, Free Chlorine and Chloramines, and Hardness. . It says; 'Check the water hardness to prevent damage to your pool or hot tub. . http://www.euro-inox.org/pdf/map/pap. In all communities the public swimming pool is an important asset both as a social requirements to be demanded in the European Norm grout standard. Specifically, the calcium/hardness level in the incoming water and the control and. Calcium Hardness Increaser prevents damage to the pool's surface, equipment, and plumbing. Visit our selection of chemicals for pool and for spa. Latham Pool Products Education Center provides an excellent resource about . Alkalinity in the ideal range of 100 to 150ppm helps the pH to resist fluctuations.