My TA is off the charts of the test strip which tops out at 240ppm. So that needs to come down obviously. My PH is also high, 8.4. Not sure whats driving it up so high; rain? leaves? dead bugs? What's the best way to bring them down? A bunch of Muriatic Acid? Can I dump about 3 gallons in at once? My pool is 12K gal. Are these high numbers creating the scaling on the tile? Thx