1. Your CYA test result = 15 ppm CYA *or* less (probably, zero).
2. It's too late to try to adjust chems.
3. If you're leaving today, see if you can get http://pool9.net/polyquat/ some polyquat algaecide locally. If you can, add 4x the normal algae dose, and put your filter on BYPASS or recirculate. (The filter tends to remove it).
4. Alternatively, add 1 gallon of PLAIN 8% bleach per 10,000 gallons of water AND put 1 or 2 'floaters' filled with chlorine tabs into the pool.
Good luck!
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