Can't keep cl level

Over the past 2 weeks I've added 8 lbs of stabilizer. I've added borax to raise the ph level. I've put in gallons of pool bleach and over 24 hours it's gone. Last night I added another 4 gallons of pool bleach alone. Tonight nothing. Add more stabilizer? Raise the Ph more? The water is crystal clear. The pool was never opened last year because I had cancer surgery and chemo.. To say the least I'm a bit frustrated.

16 x 32 inground vinyl lined 18,000 gallons. Hayward 1hp super pump, Hayward ec65 DE filter.

FC 1.0; CC 1.0; TC 0; Ph 7.3; ALK 50; CAL 80; CYA 50; Temp 83

Thanks, Marty