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great way to check carbonation...

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LeftyRighty

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Joined
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Location
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encountered a great way to check carbonation after bottling.
Bottle at least one brew in a PET plastic soda bottle. I use any Coke/Pepsi/etc 12 oz PET bottle. Fill it with your brew to within 3/4 to 1 inch of the top, gently squeeze the bottle to push the liquid level to the top and remove air from the bottle, then tightly screw the cap back on. The PET bottle will have a dent where it was squeezed.
If the yeast is doing it's job, in a few days, the dent will be gone and the air space will be back. After your normal week or two of in-bottle fermentation, the bottle will be very firm and difficult to squeeze - and when opened, you'll get the 'ppffff' sound of carbonation. Drink & enjoy.

I started bottling a part of brews with the 12 oz PET plastic bottles, because too many times I wanted to take some brews for a visit, but didn't want to mess with collecting glass bottles to take back home. Got lots of grandkids drinking soda, so free supply of PET bottles.
 
I do the same thing when I bottle (which isn't often). It's nice having an "indicator" bottle. I like to use plain seltzer bottles so no soda flavor is transferred.
 
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