Dr. Spa, the spa is 1000 gallons (at a hotel) and the chemical I test the pH with is the Taylor brand test solution "r-0004". I also use this chemical on the pool(10,000 gallon) and get an accurate reading. Thank you for your quick response, I hope this information helps diagnose the problem.
I've spent the last week playing mad scientist with the spa chemicals with no success. It's a saltwater hot tub, pH has been hovering near the 8.x range and it's killing the chlorine levels. I've been adding Acid Magic brand muriatic acid for two days. The TA is only 30, calcium 100ish, salt 3.2(ish)ppm. I'm at a loss...