We should drain and refill the pool when the TDS increases by 1500ppm over what we started with, at least partially. The only means we have to lower the level of dissolved solids is to replace water. The TDS level is not something that will decline over time – it only increases. It is essential in swimming pool maintenance that we know what that starting level is. Take into consideration that the water straight from the tap, even before you add anything, has a level of Total Dissolved Solids. What is Total Dissolved Solids? “The Age of the Water.” Even a cup of muriatic acid (containing 1.87 pounds of solids per gallon) will raise the TDS by 1.4 ppm. Per 10,000g will add 10 ppm of FAC, but will also increase your Water Hardness by 8 ppm and your Total Dissolved Solids by 15 ppm. Calhypo (Calcium Hypochlorite) added at a rate of 20 oz. of trichlor (stabilized chlorine tablets/granular) will add 10 ppm of FAC to 10,000g, but it will also increase the CYA (Cyanuric Acid) by 6 ppm and the TDS by 10 ppm. For example, a gallon of sodium hypochlorite (containing 2.34 pounds of solids) will add 12 ppm of FAC (Free Available Chlorine) to 10,000 gallons of water and will increase the TDS by 28 ppm. ?Total Dissolved SolidsĪnything you add to a pool will increase something, and everything will increase TDS.
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