Pool went south after summer levels are way off. lots of build up calcium dirt stains. Should I drain and get acid wash. Or is their hope without draining? Local pool numbers attached.
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How did they test your water? Most CYA tests only go up to 100 so for them to have a reading of 300 is unusual. Like Marty said you REALLY need to get your own test kit as most pool stores don't do the test correctly or if it a machine they do not calibrate it as needed.
IF those numbers are even close then yes you do need to remove and replace quite a bit of the water. As for draining and acid washing that is up to you. Just know the acid wash will remove some of the plaster and that could shorten your plaster's life.