Conditions and baseline
The internal evidence summary dates the 30% MHL period from October 2025 and the Suppressor period from 30 April 2026. Exact phase end dates and durations, and the undosed baseline dates, are not supplied. Critical Elixirs reports an undosed downstream mean gas-phase H₂S reading of 29.7 ppm at a wet-well monitoring point.
Method
The case-study summary describes 1-minute gas-phase H₂S logger readings at two wet-well locations during separate undosed, magnesium hydroxide liquid (MHL) and Suppressor periods. An internal evidence summary says the periods were not season-matched and that flow and temperature differed. A separate June pump check is reported at approximately 1.45 L/min, but the available summary does not link that check to the treatment periods.
Reported outcome
At the downstream monitoring point, Critical Elixirs reports mean gas-phase H₂S readings of 29.7 ppm during the undosed period, 5.3 ppm during the MHL period, and 1.5 ppm during the Suppressor period. These are reported values from separate historical operating periods, not results from a controlled or season-matched trial.
Reported dosing figures were:
- Magnesium hydroxide liquid (MHL; described as 30% MHL in the source summary)
- ≈175 L/day; reported reach ≈1.95–2.0 km from a mid-network dose point
- Suppressor
- Corrected representative volume ≈140 L/day; reported reach ≈3.6–3.65 km from an upstream dose point
Evidence and limitations
This account is based on information supplied by Critical Elixirs and has not been independently verified. The supplied case-study summary describes 1-minute gas-phase H₂S logger data, but the underlying logger exports and exact phase boundaries were not available for review. A newer internal summary corrects the older case-study’s 125 L/day Suppressor comparison basis to a representative 140 L/day.
The different operating periods were not season-matched; flow and temperature differed, so the readings do not establish a controlled product comparison or a guaranteed treatment response. Dose volumes and network reach do not establish equal treatment duty or cost savings; no unit-price or cost basis was supplied. Pump calibration is separate from treatment response: the reported June pump check is not evidence of delivered dose across these periods. Fixed wet-well gas loggers assess process-area conditions, not personal worker exposure or exposure-limit compliance. No measured corrosion reduction is established.