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Cleaning and sanitising them all
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Priming and capping
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Storing them all while waiting for secondary to finish
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Breakages / explosions / variations in carbonation
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Yeast sediment that sets like glue if you don't rinse immediately
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The mess to clean up the day after mates come over
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Having to cart a bunch of bottles to a bbq then bring them home
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Rinsing them when you get home to avoid yeast glue
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Starting all over again...