OK. So I drained the entire pool (10,500 gallons) on April 1, 2021 and refilled it. After balancing the pool chemicals to the usual levels, I checked the TDS with a hand-held unit I bought from Hanna Instruments. As of April 7, it was 402. I check it every few weeks or so and it has increased gradually. Today it's at 1345. I have read some recommendations that if it goes above 1500, I should drain off half of the water and refill. This pool is not SWG. I only add Muriatic Acid for PH control and 12.5% liquid chlorine for FC. The folks at Clear Comfort have told me that the 1500 ppm is totally arbitrary and that I shouldn't do anything unless I notice any changes in the pool water. The pool water today (and always) is crystal clear and nobody is complaining. I am assuming that as LC and MA are added, the byproduct is NaCl or just salt. I'm just wondering if the folks at TFP have any opinions about this? Such as at what level of TDS should I consider a partial drain?