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Ok, tested CYA again, at best I would call it 5. The pool store has a computer to test water sample, they said CYA 55. Said that was ok. If I'm reading the chorine/cya calculator right, with a cya of 30, I need a shock FC OF 12. Using the pool math calc on 20k gallons, I need to add 241 oz...

Sorry about the picture. I thought I read everything before making first post. I'm going to check CYA again, it was cloudy at the top but you could still see black dot.

FC. - 8 CC -1 TC- 9 CYA - 0, TA -190 Cal Hard- 20 PH - 7.2 Bought a home with a pool, it hasn't been used for over 18 months. All winter I scooped out leaves and debris from bottom. Started with a local pool company 2 months ago, had me add algaecides, chlorine, metal magic after bottom turned...