Unfortunately, the only effective way to reduce CYA is to replace some or all of your water. What is the CH of your fill water source? If it's much lower than 1250, you might get double benefit from doing at least a partial drain and refill.
With a CYA of 500, I'm not sure where you would even need to keep your chlorine level to maintain effective sanitation.
The calcium scaling can be softened by lowering the pH. You can buy gel "tile and liner" cleaner products which are acidic to localize the low ph and help you clean. Just be careful you don't reduce the overall pH in your water too much as you risk damaging pool surfaces much below 7.0
If your fill water is that hard, it might be worth your time to price out having fill water trucked in. Sorry I don't have any better advice to give you.
Since you've got tile by your waterline, you can use a razor blade to help scrape off the calcium. Home Depot/Lowes/Scotty's sell little handles for flat razor blades in the paint section of the store. I soften with tile/liner cleaner, and then scrape (with rubber gloves).
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