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Yesterday when testing, sample would become hot pink after adding DPD powder. Today took sample same way, added same amount (heaping scoop) and sample will not turn pink? Any ideas?

Hi all, I'm Dan. It's my second year maintaining a 21' Round AGP , ~10,400 gal. When i opened it this year, I thought I was in good shape, put realized that my pool wouldn't hold FC. After about $200 in pool chemicals and no improvement, I decided to change to BBB method. I received my TF100...