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I feel really dumb for not even thinking of that! The pool is on an automatic filler connected to a water softener so I always thought of the water as having low TA. I just measured TA of the fill water, three times for good measure and guess what? 200 ppm each time. Looks like I've been...

Hello, glad to be here.. We have a rectangular swimming pool of approximately 25 K gallons with a salt water system, waterfall on separate pump. DE filter which I clean (no backflush) every 3 months. I keep the Chlor and PH right where they should be. No CYA problems. Water temperature hovers...