Cl test didn't turn pink

Hmmm, i always seem to get pink when I start out even if I didn't think I had any Cl in the h20. Doesn't take but a drop to turn it clear sometimes, but always had a shade of pink to start. Assumed the powder just turned it pink to start with... I guess I've always had 'some' Cl in the water then. Sorry for the stupid question!
 
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