Need some help please, I have a 16,000 gallon pool that was recently drained in May 2022. Professional company restarted chemistry, I maintain. I use about 1-2 tablets of Leslie's chlorine tabs a week. I test for ph, chlorine, and alk weekly. I add muriatic acid weekly for high ph, I have a water feature. I also add about 5 lbs of bi carb every two weeks to counter the alk drop from the acid. I typically have high ph and low alk. I also do a weekly phos dose given lots of debris in pool. In about 90 days the CYA has gone from 30 ppm to 100ppm. Test info from pool store may be an issue, but magnitude and direction of increase is concerning. What could cause CYA to spike that quickly. It hurts my gut to think about having to drain the pool after just doing that. Hoping to find root cause if possible.