I actually just did this a couple weeks ago. The water sat overnight then I used the water for brewing 2 more batches. I collected the water in a 20 gallon food safe garbage can. The wort from both batches tasted good. Now to taste the beers since they are done fermenting!
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Thanks, I'm going to give it a go this weekend. Gonna save the water from Saturday's brew and use it for the mash and sparge for the Sunday brew.