I've been curious about this......
I thought the only ways to lose FC was via sunlight or organics. However when I re-fill my spa, I add 2 tablespoons of DiChlor to get the FC to 13. Then 5 days later after no use or exposure to sunlight, FC =5.5.
What is consuming the free chlorine? Is it that the fill water has organics in it?
I thought the only ways to lose FC was via sunlight or organics. However when I re-fill my spa, I add 2 tablespoons of DiChlor to get the FC to 13. Then 5 days later after no use or exposure to sunlight, FC =5.5.
What is consuming the free chlorine? Is it that the fill water has organics in it?