Hayward W3SAS-PRO Salt-Swim-Inground-30000-Gallons-Owners-Manual-092742RevB - Page 10
Water Chemistry, Saturation index
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Water Chemistry The table below summarizes the levels that are recommended by The Association of Pool and Spa Professionals (APSP). It is important to maintain these levels in order to prevent corrosion or scaling and to ensure maximum performance from your Salt & Swim chlorine generator. Have your water tested or use pool water test strips and refer to the Chemistry Quick Start Guide information on testing and adjusting your pool's water chemistry. Your Authorized Salt & Swim Dealer or most pool stores can provide you with the chemicals and procedures to adjust the water chemistry as well. Note that pool water emanating from wells and municipal water supplies, along with the introduction of environmental contaminants, can contain chemistries that are deleterious to the life expectancy of the Cell. Saturation index The saturation index (Si) relates to the calcium and alkalinity in the water and is an indicator of the pool water "balance". Your water is properly balanced if the Si is 0 ±.2. If the Si is below -0.2, the water is corrosive and plaster pool walls will be dissolved into the water. If the Si is above +0.2, scaling and staining will occur. Use the chart below to determine the saturation index. Si = pH + Ti + Ci + Ai - TDS °C °F Ti Hardness Calcium Ci Total alkalinity Ai Total Dissolved Solids TDS 12 53 0.3 75 16 60 0.4 100 125 19 66 0.5 150 24 76 0.6 200 250 29 84 0.7 300 34 94 0.8 400 600 39 102 0.9 800 1.5 75 1.6 100 1.7 125 1.8 150 1.9 200 2.0 250 2.1 300 2.2 400 2.4 600 2.5 800 1.9 0-1000 12.10 2.0 2.1 1001-2000 12.29 2.2 2.3 2.4 2001-3000 12.35 2.5 2.6 3001-4000 12.41 2.8 2.9 4001-5000 12.44 Use: Measure the pH of the pool water, the temperature, water hardness, total alkalinity, and total dissolved solids. Use the table above to determine Ti, Ci, Ai, and TDS in the formula shown above. If the Si is equal to 0.2 or more, stains may appear. If the Si is equal to -0.2 or less, corrosion or deterioration may occur. -0.2 Corrosion 0.2 Stain Ok 8 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS