your CYA is 80, so I would not use the chlorine tablets anymore; most of them I think are trichlor, which will continue to raise your CYA and cause you to have to maintain higher FC levels!
the 2005 kit is DPD, not DPD-FAS, and as Ben stated it can bleach out at higher FC levels- indicating 0 when really 15! The OTO kit will turn orange or brown at higher levels, instead of clear, so will give you
true, if not accurate, indication of FC presence!
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