I'm starting a AA treatment tomorrow to get rid of some metal stains and putting Jack's magic the Pink Stuff. I just brought up my Calcium Hardness level to 200 because I have heater. My PH is 7.2 and Alk is 70 currently. Once I put the AA and the sequestrant the PH will fall down, not sure how low, but should I be concerned with the heater since the PH will probably drop under 7.0?