5 definately 5. the 1's get clogged with trichromes and take forever to drain. keeping the 5's clean it pretty much pours thru. i bought 8 bags and used them all then decided i wanted all the sizes mixed together in the end anyway. some trichromes taste really good but have little high, some have excellent high but no flavor. so now i use my #5 bag and my #1 bag. but definately go with at least 5 gallon. even for small batches.
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