Hi all! Got my Taylor K test kit today. Attempting my first test, but just on the free chlorine I'm following instructions. Elbow deep water, filled to the 25 ml line. Added to dips of dpd powder. Water is almost red. I'm adding the R O871, 141 drops later in the water still has not changed to clear! I know my chlorine is high because we were dealing with a high cya plus mustard algae problem. But we've drained and refilled half the pool to lower cya, and have just been doing one gallon of bleach per day since that drain on Monday.