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Do not use bleach, Fresh water or do what i do and use the water from my PWC's fill the pail 1/2 way with sand top off with water and stir dump dirty water and repeat. Bleach or vinegar will kill any thing living in the sand.
You can rinse in tap water i'm cheap lol and hate to toss my old salt water so if i know i'm going to be setting up a tank i'll use the old water kinda like recycling