What is TDS? The total of all minerals, chemicals and solids dissolved in the water TDS accumulates through the normal life of the pool water TDS will be lowest when a pool is freshly filled Maximum recommended range: 2,500 ppm in traditional pool 1,500 ppm over ideal salt level in salt pool 1,500 ppm in a hot tub Why is it important? As TDs elevates, the normal management of pool water becomes more difficult Sanitizer efficiency reduces Corrosion can increase Water clarity reduces Reduced chemical efficiency Increased problems - more difficult maintenance Why does TDS change? Every product added to treat water will have an effect on TDS Normal Environmental exposure Bather Waste Fill Water How to correct high TDS: When above maximum recommended level Dilute pool water with make-up water of a lower TDS Normal evaporation and top-up does not lower TDS - it raises it Hot tubs can be drained and refilled