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How quickly does CYA deplete in a hot tub that is not exposed to UV? What are the consequences of CYA falling below 20? I have seen in the forums that using bleach with CYA at low levels is too harsh? What exactly does harsh mean? Is it unsafe? Thanks in advance

After a year of frustration, trying to keep up with an ever increasing chlorine load and nothing but bad advice from my dealer, I tried the TFP Dichlor to Bleach method. The results have been nothing but amazing. Two months in and the levels are all rock solid and the water is crystal clear...