47a8b40fdb
TREE(74): training modules, entity profiles, 2890 references, keyword indices SPROUT(42): knowledge pages, project docs, curated source material SEED(164): daily notes, raw session logs, unprocessed material Updated AUDIT_MANIFEST.json with growth classifications.
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pageType, id, title, sourceType, sourcePath, ingestedAt, updatedAt, status, growth
| pageType | id | title | sourceType | sourcePath | ingestedAt | updatedAt | status | growth |
|---|---|---|---|---|---|---|---|---|
| source | source.psb-gemma-2026-04-01 | psb-gemma-2026-04-01 | local-file | /home/topher/.openclaw/workspace-psb-gemma/memory/2026-04-01.md | 2026-05-03T01:11:30.157Z | 2026-05-03T01:11:30.157Z | active | seed |
psb-gemma-2026-04-01
Source
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/home/topher/.openclaw/workspace-psb-gemma/memory/2026-04-01.md - Bytes: 931
- Updated: 2026-05-03T01:11:30.157Z
Content
## Yeast Propagation — Cost Correction (Apr 1, 2026)
### Old Practice (wasteful)
- 110 gal: 7.5 lbs DME propagation + brick yeast = ~$41.50/batch
- 70 gal: 3.5 lbs DME propagation + brick yeast
- Pitch rate was still borderline under
### New Practice (optimal)
- Direct pitch from brick: 75–100g per 110 gal batch
- 100g from 500g brick = 5 batches = $33/batch yeast
- Zero DME cost for propagation
- Proper pitch rate achieved
### Key Numbers (LD Carlson prices)
| Item | Price |
|---|---|
| DME Briess 50 lb | $110.00 |
| Nottingham brick 500g | $165.00 |
| Nottingham satchel 11g | $3.59 (MoreBeer) |
### Realization
- Full propagation (10 lb DME) costs nearly as much as direct pitch from brick
- Simple propagation (1 lb DME) saves only ~$7/batch vs direct pitch
- Underpitching + DME propagation was the worst of all worlds: expensive AND underpitched
- Brick direct pitch is the move for 3.5 bbl Nottingham batches
Notes
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