60 lines
1.6 KiB
Markdown
60 lines
1.6 KiB
Markdown
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---
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pageType: source
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id: source.psb-gemma-2026-04-01
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title: psb-gemma-2026-04-01
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sourceType: local-file
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sourcePath: /home/topher/.openclaw/workspace-psb-gemma/memory/2026-04-01.md
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ingestedAt: 2026-05-03T01:11:30.157Z
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updatedAt: 2026-05-03T01:11:30.157Z
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status: active
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growth: seed
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---
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# psb-gemma-2026-04-01
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## Source
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- Type: `local-file`
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- Path: `/home/topher/.openclaw/workspace-psb-gemma/memory/2026-04-01.md`
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- Bytes: 931
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- Updated: 2026-05-03T01:11:30.157Z
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## Content
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```text
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## Yeast Propagation — Cost Correction (Apr 1, 2026)
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### Old Practice (wasteful)
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- 110 gal: 7.5 lbs DME propagation + brick yeast = ~$41.50/batch
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- 70 gal: 3.5 lbs DME propagation + brick yeast
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- Pitch rate was still borderline under
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### New Practice (optimal)
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- Direct pitch from brick: 75–100g per 110 gal batch
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- 100g from 500g brick = 5 batches = $33/batch yeast
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- Zero DME cost for propagation
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- Proper pitch rate achieved
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### Key Numbers (LD Carlson prices)
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| Item | Price |
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|---|---|
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| DME Briess 50 lb | $110.00 |
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| Nottingham brick 500g | $165.00 |
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| Nottingham satchel 11g | $3.59 (MoreBeer) |
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### Realization
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- Full propagation (10 lb DME) costs nearly as much as direct pitch from brick
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- Simple propagation (1 lb DME) saves only ~$7/batch vs direct pitch
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- Underpitching + DME propagation was the worst of all worlds: expensive AND underpitched
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- Brick direct pitch is the move for 3.5 bbl Nottingham batches
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```
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## Notes
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<!-- openclaw:human:start -->
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<!-- openclaw:human:end -->
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## Related
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<!-- openclaw:wiki:related:start -->
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- No related pages yet.
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<!-- openclaw:wiki:related:end -->
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