Why 750 mL and not 500 or 1,000
Paul Fournier
— WEEKLY EDITION · FRIDAY JUNE 26 —
500 mL is too short. 1 L is too slow.
500 mL: enrichment cycle 2.5 min. Theoretical max concentration 9,200 PPB, but ±18% variance due to low buffer volume. Imprecise DPD measurement.
1,000 mL: 6-min cycle. More stable (±4% variance) but loss of practicality (volume too large for daily use), and reduced cell lifespan (more usage = more cycles).
750 mL: 4-min cycle. ±5% variance (DPD-compatible). Ergonomic volume. Optimal cell lifespan (3 cycles/day × 5 years = 5,475 cycles, within the 5,000+ warranty).
The 750 mL choice isn't a design intuition — it's 9 months of A/B testing at the workshop in 2024.
750 mL Optimal volume · 4 min Full cycle · ±5% DPD variance
«A bottle's volume is an engineering decision. Not a marketing decision.»
Paul Fournier · HYDROGENYX Founder
