Since you were all so quick to respond to my questions, I figured I should give an update on what helped me. Dropping the pH level really helped soften up a lot of the scale. When I went into the spa a couple days after keeping the pH down, some of the scale came right off using my bare hand. There were some trouble spots. For those, I purchased a stainless steel pot scrubber from the market and went to work. The seating areas in the pool, which I was most concerned about, is now as smooth as new. There are still some rough spots on the floor which I'll get to another time but I'm not too concerned. Provides some traction so not completely a bad thing.
One drawback of the stainless steel scrubber was that small pieces started to break off after heavy use. Being that I have dark plaster, it was hard to see the pieces and I'm sure some went into my filter. Now to clean out my filter, which is overdue anyway.
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