As previously discussed, after adding the bleach to the pool at about 11:30am on Thursday and checking the FC at about 3:30pm, the level was 22.5 ...... then again checking about 7:00pm, the FC was about 22.0 (Thursday, 10/16/14). The pump ran all night and the recheck in the morning (about 8:30 am) the FC level was 19.5 (Friday, 10/17/14). I was concerned that the chlorine was not eliminating the organics, and the pool had somewhat of a green cast to it. I let the pool pump to continue to run until about 6:00pm and rechecked the FC which came in at 19.5 ppm. The pump did not continue to run last night but did kick on in the morning according to schedule, I checked the FC again (about 9:30 am on Saturday, 10/18/14) and it recorded as 18.5 ppm. And, the pool looked much better than previously, the green cast is gone.

The weather has been sunny but not real warm, mid 70's for the high and mid 50's for the lows. I am hoping that we have taken care of the problem. However, I am concerned with the differences in the FC during the overnight of the first comparison (between Thursday and Friday). Could the testing procedure at 10 ml sample provide a greater opportunity for error when using the titrate liquid and multiplying the result by 0.5 ppm? What do you all think?