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Old 04-07-2013, 04:04 AM   #11
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I usually use a tsp per gallon. Seems to work fine. Once in a while I have to do a second soak.



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Old 04-07-2013, 12:43 PM   #12
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I've always used 1 tsp per gallon as well and it has always worked great.

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Old 10-11-2013, 09:00 AM   #13
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Originally Posted by dutchoven View Post
I keep a 5-gallon bucket of solution on hand; 3.75 oz (weight) PBW per 5 gallons. I soak my carboys half to 3/4 full and swish it around every now and again.
Keeping solution around for more than a few hours at most isn't a good idea. PBW is comprised of sodium metasilicate and sodium percarbonate (oxiclean). Metasilicate will etch glass, but retains its cleaning power for a long time in solution (so it'll be fine in a plastic bucket). The percarbonate is another matter; once dissolved in water it will generate hydrogen peroxide, which will continue to decompose. The cleaning performance will be dramatically reduced after a few hours, as the peroxides help to oxidize and break up organic residue.

As for the concentration to use, the directions say 1 to 2 fluid ounces per gallon; 2 tablespoons (tbsp, not tsp) make 1 ounce -- so it calls for 2-4 tablespoons per gallon.
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