Following all the helpful advise I've found here I think I'm in control. Here are my numbers:
Calcium Hardness 239
Total Disolved Solids 340
Except for the CYA I think this is good. (I have LOTS of trichor tabs from the previous owner and am going to use these up and since they add CYA I figure I'll watch this and stop when it gets higher)
Still, the water's a bit murky. It does clear up as stuff settles to the bottom. I've been vacuuming this up but stirring up the water, I lose sight of the deep (8') end. Improvements in water clarity are pretty slow now compared to when I started. So two questions:
1) Is it good to swim in?
2) What's the best way to make it sparkle?
I have a bottle of poly blue sheen left from the previous owner. Are there some side effects to using this or should I give it a go?