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DIY CO2 turning pink

I notice that my yeast mixtures turns pink after a few days.  I have not
changed my mixture or anything and I think I'm not getting the same
bubbling rate in the past.  I used 1 cup of sugar, 1/2 teaspoon of yeast,
and tap water in a 2 liter pop bottle injected into a cannister filter. 
This usually last 2 to 3 weeks.  What could possibly be cause this pink
yeast mixture?  Thanks.