Hello, I'm a newbie here, just wanted to share what a newbie just went thru for over 3 weeks, Bought a new spa about a month ago, followed instructions to the tee on set up and chemicals. The next morning my PH was off the charts, All other tests were within range, except alkalinity, it was about 70. I added PH down (sodium bisulfate 93.2%) to the suction, filter basket like it said to do and turn on high for about 15 min then retest in 30 min. To make a long story short I added over 20 oz. to finally see my PH come down to 7.8. Seemed like a lot, I was beginning to think to myself I made a bad purchase, If I have to do this all the time. The next morning was the same thing, my PH was off the charts again, and no one used it, I did have the filter cycle go on for about 1.5 hours during the night. This has been going on for about 3 weeks now, along with my alkalinity jumping all over the place also. Well, I found the answer to my problem, I read somewhere online or in a forum or just a page somewhere that you should not use the bubbler while mixing chemicals, it said it will raise PH by adding Oxygen or carbon dioxide, I can't remember ( A chain Reaction thing). (Air to the Jets) during the filter cycles and while adding chemicals to the spa, So I now turn on high without air being injected to the spa. The testing has been right on now for over 3 days now. Good Grief ! ! Just wanted to share a what a newbie like me went thru. I never owned a spa in my life, I guess at over age 60 I still can learn. My heart rate finally went to normal as well.