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What it does :
Plastic buckets are used by homebrewers for fermentation and mixing bottle priming. Typical bucket volume is 5 gallons (18.9 liters), plus headspace to allow for the foaming that accompanies fermentation.
What it is:
A plastic bucket is a food-grade plastic container. Those made specifically for homebrewing come with a snap-tight lid and volume measurement lines on one side, and a spigot hole near the bottom.
How it works:
Snap-tight lids are used with plastic buckets to keep foreign matter out when used as a fermentation container. Airlocks are mounted on top to vent the gases produced during fermentation. A spigot is mounted near the bottom to allow draining after fermentation is complete.
Plastic buckets are used for the cold side of brewing (e.g. fermentation, bottling, and packaging). The buckets come in direct contact with the beer during the critical fermentation stage. So, the buckets should be sanitized before use to prevent contamination.