1. OTO orange = Chlorine > 15 ppm . . . but that is NOT necessarily a problem. See below.

2. pH testing with chlorine > 15 ppm is NOT reliable. Purchase a gallon of DISTILLED water (not: "spring", "bottled", etc => must be "distilled") at Walmart. Mix 1/2 cup distilled with 1/4 cup pool water; retest. Result will be approximately correct. Assuming the test with distilled water confirms the earlier result, use borax as suggested.

3. If your CYA (stabilizer) is below 30 ppm, you will lose almost all chlorine in a single day of sunshine. If your CYA is above 100 ppm, you will lose very little of it in 3 - 4 days of sun. Pending arrival of the K2006, you can estimate your CYA level more accurately that way, than with test strips.