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The pH of a pool should be around 7.4. pH has a tendency to move up in a pool, due to dirt, sweat, lotion, urine, etc. Higher pH means less effective chlorine. You can usually lower the pH by adding muriatic acid.
The TDS of a pool doesn’t really have an official recommended value. For regular chlorine pools, most pool operators will try to keep the TDS around 1500 ppm (1.5 ppt). For a pool that has a salt-chlorine generator, the TDS value will depend on the manufacturer of the generator; it’s usually around 3500 ppm (3.5 ppt).
"We have chosen and use Hanna pHep4 meters to test our pools for about 10 years. They are very accurate, easy to calibrate and dependable. We particularly like the replaceable probes. We also have TDS meters for field use."
- Suzie, OK
On July 23, 2010 HANNA Instruments USA President David Minsk and technical application specialist Michael Bogolawski hosted a webinar regarding sales of Chlorine and ORP (Oxidation Reduction Potential). This white paper is a review of that webinar.