New answers tagged capping
You say the caps were "firmly on". No offense, but if they're leaking the caps weren't fully sealed. Possible culprits could be the bottles or caps you use, your capper, or your technique. we need to know more about what you do and how you do it to narrow that list down.
It sounds like you're not getting a good seal on the caps. Do you notice carb loss over time? Do they leak when you simply tip them upside down? If so, it could be any number of things: the capper, your technique or the bottle itself (e.g. twist off rather than pry-off).
Were you using plastic pet bottles? If you use soda bottles some of them have a blue plastic seal under the cap which acts like a washer when you screw the cap down. If the cap is old the plastic seal may not be effective. Another option is that some plastic bottles do not use the blue plastic seal so you have to be careful as the what bottles go with ...
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