We don't store our litter for 30 days so I can't confirm it works for that period. It seems to be effective in fighting odors for the most part. I suspect it also depends on the type and amount of litter you use as well as the number of pets in the house. Comparing the cost of adding this to my fountain pen, I'm not sure if I'll keep buying it or just buy a fountain pen with these types of additions or features already included.
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