Just filled my new Intex 12' x 30" 1700 gal. round metal pool. I put a floating chlorine dispenser in yesterday and tested my water this morning. My hth 3-way test kit read chlorine at 5 and Br at 10. I took the dispenser out. The pH only reads 7.2. What is the correct level for pH and what chemical do I add to correct the pH. I looked at pool math but that's a lot of numbers and abbreviations that I'm just not understanding.