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Upon fresh fill these are my readings: Gallons 425 CH: 130ppm TA: 60ppm (target 90ppm) PH: 7.0ppm (target 7.6ppm) I am going to leave CH alone but was wondering if I should raise PH first (sodium carbonate)? I know this will also raise TA and then I could adjust TA as necessary. Or should I...

I understand the need to shock a spa when the water becomes cloudy or another adverse condition exists but I don't understand why you must shock the spa right after a fresh fill. If I am able to start with 4-5ppm Bromine after balancing and building up a Bromide reserve, why is it necessary to...