OK. Watermom asked me to take a look. Please do the following:

1. Add borax 3 boxes at time (slowly, in the skimmer, pump running).
2. You know your CYA is high, and you know you've got slime, so look at the Best Guess chart: you need 25ppm of chlorine! For a 36,000 gallon pool, that's 16 gallons. BUT, we've got to get that pH up first, so add ONLY 12 gallons for now.
3. Get a gallon of distilled water (must say "distilled", not spring, not Ozonated, not natural: "distilled"!) at Walmart in the water section.
4. Begin testing pH with 1/2 pool water and 1/2 distilled water. (With distilled water, the pH will still be about the same) High chlorine can create bogus phenol red results.
5. AND, retest the CYA, with 1/2 pool water and 1/2 distilled. In this case, multiple the result X2.
6. Let us know if the green color is CLOUDY green (algae) or CLEAR green (alkalinity or sometimes iron).
7. As SOON as you have a valid pH greater than 7.2, add 2 MORE boxes of borax, and then enough chlorine to get to 25 ppm.

Good luck!