Sewer dosing
Septine sewer dosing
Who this is for
Utility operations managers, sewer network engineers and chemical procurement teams
Your operating priority
Assess a bespoke sewer H₂S-control chemistry on treatment performance and whole-of-operation cost, not the drum price alone.
Before you specify or buy
Establish a baseline, comparable dosing duty, monitoring locations and delivered treatment cost before comparing Septine with your current chemistry. Calibration and performance review can also be commissioned independently of product supply.
Critical Elixirs field work
Sewer dosing, access points and wet-well sampling
Critical Elixirs dosing equipment and field activity across our projects, showing treatment delivery, maintenance and network monitoring.
Trailer dosing equipment connected to a sewer access point. 
Trailer-mounted dosing equipment deployed beside a field access point. 
Hands-on field work at a dosing installation. Site procedures, equipment checks and duty-specific settings support ongoing operation. 
Water-quality sampling at a grated wet-well access point, with portable instruments and sample handling equipment.
Critical Elixirs · Sewer network outcomes
Septine V2: field performance and dosing optimisation
Outcomes achieved across three treatment periods in one sewer network. Both proprietary treatments achieved lower downstream mean H₂S readings and operated at lower product volumes than the earlier MHL period. The figures below show each treatment’s operating context.
Earlier reference period
30% magnesium hydroxide liquid (MHL)
- Product volume
- 175–190 L/day
- Historical downstream mean H₂S
- ~5.3 ppm
- Dosing point and treatment reach
- ~1.95–2.0 km, mid-network dosing, 3 SPS
Historical downstream mean, gas-phase H₂S.
Separate proprietary treatment
Suppressor
- Product volume
- ~140 L/day representative
- Historical downstream mean H₂S
- ~1.5 ppm
- Dosing point and treatment reach
- ~3.6–3.65 km, upstream dosing, 5 SPS
Historical mean spans operational dose adjustments. Approximately 140 L/day is the representative operating rate.
Optimised operating period
Septine V2
- Product volume
- ~100 L/day (operating range 100–110 L/day)
- Historical downstream mean H₂S
- ~2.27 ppm
- Dosing point and treatment reach
- ~3.6–3.65 km, upstream dosing, 5 SPS
16 September 2026 analysis, including weekends. The 23 August–9 September dosing blockage is excluded from this operating-period mean.
These are separate historical operating periods, with different flows and conditions, rather than a season-matched controlled trial. Mean gas readings describe network treatment performance; worker exposure and safe entry require separate assessment.
Ongoing monitoring and optimisation
Monitoring observations on 12 October 2026 showed operation near 100 L/day with H₂S around 10 ppm and Sunday-night/Monday-morning excursions near 20 ppm. These are separate observations and are not part of the earlier 2.27 ppm mean. Tracking these changes informs ongoing optimisation.
Dosing optimisation timeline
Operating rates and approximate changeover dates across commissioning and optimisation. The future development target is shown separately from achieved operation.
| Stage | Rate | Status |
|---|---|---|
| Septine V14–19 August 2026 | ~116–118 L/day | Field operation |
| Septine V2, commissioning19–21 August 2026 | ~130 L/day | Commissioned |
| Septine V2, optimisationFrom 21 August 2026 | ~100–110 L/day | Optimised operation |
| Future stronger formulationNot yet deployed | Target 70–80 L/day for approx. 1 ML/day sewage | Development target — not yet deployed |
Suppressor and Septine are separate formulations, with their results kept distinct. For each new network, we assess treatment duty, calibrate delivery and monitor downstream response to establish the operating programme.
Source: Critical Elixirs network monitoring, operational summaries and development records, August–October 2026, alongside the earlier MHL and Suppressor case study. Customer and monitoring-location identities remain confidential.
What is covered
- Developed for sewer utility H₂S and sulphide management where site conditions and agreed treatment objectives make it suitable.
- Our Septine comparisons have shown advantages in strength and concentration per supplied volume, dose rate and generally treatment cost in the applications assessed; results are site- and comparator-specific.
- Septine supplied with dosing equipment, connection and calibration support.
- Performance and total treatment cost are application dependent. Compare options on site-specific data, including dose rate, delivered volume and the whole dosing arrangement.
- Dosing calibration and performance reporting can also be provided independently of the chemistry selected or its supplier.
- Dosing location, network conditions and monitoring reviewed with in-house RPEQ capability.
- Deployment is available for suitable projects across Australia, subject to scope, access and mobilisation logistics.
What we will ask you
- Network layout and dosing location
- Current chemistry, dose rate and delivered cost
- Access, power and security at the dosing point
- Monitoring data available for comparison
This page is information only. Pricing, availability and specifications are provided through an enquiry.
Straight answers
Frequently asked questions
- How should a utility compare Septine with its existing sewer dosing chemistry?
- Compare a defined treatment duty using baseline network data, actual delivered dose, relevant downstream measurements and total treatment cost. Include storage, resupply and operator effort. Septine is a separate formulation from Suppressor; neither product name nor concentration alone proves a lower operating cost.