Following the Ben's advice to lower the alkalinity of the pool water, I improvised my own method. It works well! I brought down the level, over the course of 4 days, from over 300 to 180. Still aerating and maintaining the pH at 7.2 or a little lower. It DOES rise during this process.
The most helpful thing I've learned so far is that this is a process that takes patience and diligence. Heavy on the patience.
Also, for the experts, I included a couple of pics of my pool pump for advice purposes. We were talking about where to put a pressure gauge.
[ PoolDoc note => pics moved to following post ]
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