How long can you keep PBW in solution?

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joety

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I generally replace my Starsan every 2-3 weeks since I don't stock ph strips and it's relatively inexpensive. However, for my PBW I keep in five gallon buckets, I just add a couple fresh tablespoons every other week or so. It's probably been six months since I replaced it entirely. Does it maintain its effectiveness in solution over time?
 
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