TOTAL DISSOLVED SOLIDS (TDS):
Perfect Range 0 TO 2,000 PPM
Temperature + Total Alkalinity + pH + Calcium Hardness + Stabilizer Adjustment + TDS = Saturation Index
Total Dissolved Solids is a measure of the gradual build up of chemical by products. The continual "dumping" of chemicals in the pool water and constant chemical reactions taking place eventually leads to a build up of unwanted solids in solution. However, most outdoor pools lose a significant amount of water due to splashing as well as from partial draining due to rain and filter backwashing. Spa's are completely drained and refilled on a periodic basis for general maintenance.
Most pool and spa water is below 2,000 PPM and has little effect on water balance. It is only mentioned here because it is a factor that is plugged into the Saturation Index formula.
Here is an interesting article on TDS: PPOA Article on Total Dissolved Solids
Perfect Pool and Spa Software! Users: Average TDS is built into the formulas and recommendations. No testing is necessary.
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