Am I starting to see a pattern of when my FC is low I don't have as much uv loss as when it is high? EXAMPLE : Say I start out in the morning with a FC of 20 and loose 7-8 ppm by sunset..........but if I start at FC of 10 in the morning I only loose 4-5 by sunset. cya, ambient temp, uv index all would be the same for both scenarios in the example. Thanks