I have read How do I use Chlorine in my Spa (or pool) but I have a question... My pH is over 8. My HT is 410 gallons. Per the Pool Calculator, I am told to add 1 oz and 5 teaspoons of Muriatic acid to bring it to 7.0. I have been running it like the instructions stated for 30 minutes and it is still over 8. Do I continue adding acid unit it drops? How long should I wait between doses? Sorry for all the questions, but I really don't want to screw this up...