Hi Dave,
I just joined the forum yesterday and am still learning, but am working on a similar issue. My understanding is that if you have a heater or plaster (or both), you want to keep your Alk in the 80-120 range because scaling happens at higher levels. I believe the range is higher for vinyl pools, but I have plaster, so I didn't commit that to memory. Check out the "How to Lower your Alkalinity" sticky--it's very helpful.
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