ASAP, purchase (20) jugs of bleach, and (6) boxes of 20 Mule Team borax (detergent section @ Walmart), (1) gallon of DISTILLED water (not spring, treated, crystal, etc => DISTILLED) and a cheap OTO / phenol red testkit. As WaterMom cautioned, you are on the edge of an algae bloom.

Besides the dosing WaterMom told you:
+ ALSO add (3) boxes of plain borax . Add them slowly to the skimmer, while the pump is running. Do NOT choke the skimmer -- if you do, you can form solid lumps of borax that are hard to dissolve.

+ Retest your CYA, using 1/4 cup pool water and 3/4 cup distilled. Multiple the result x3

+ Retest pH this PM. If chlorine is > 10 ppm, test using a 50:50 dilution of pool water with DISTILLED water. (This only works with DISTILLED water; use tap water or other water, and the result will be meaningless.)