creatine while on gear

A little off topic, but I have some creatine that has been open now for a little over a year, I use it on and off. I know it turns to creatinine, a waste product, just not sure on the timing of that and when it happens. Anyone know if the creatine I have is still good after being open that long or should I just go out and spend the $30 on a new container?
 
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