Had copper stains and used PinchAPenney Stop Stains to try to remove. After 11 days ph below 6.5 (maybe lower) got algae bloom. Stains reduced by 50-60%. Was advised to raise TA and PH and then shock pool. Raised TA to 100, PH to 7.2. Then was advised to add 5lbs shock. Water turned from cloudy green to mildly cloudy blue. Advised to add 1 lb shock and water turned clear blue. TA at 100, PH at 7.4, FC at 1.5, CC at 20+, CYA at 50. Calcium hardness at 395 and TDS at 800. I am using Taylor K-2006 Kit. Will CC go down by itself over time? Can I use breakpoint chlorination (raise to 10 times CC of 20+ or over 200ppm). How much shock in a 18,000 gal pool? Thanks JohnM