The N4, for working lagoons
A lagoon is working infrastructure: it has a job, a load, neighbors, and inspections. The N4 is the platform built out for that duty, sized for lagoons of 1-10 acres carrying high organic loads, where the questions that matter are odor, uptime, and what the record shows when someone official asks.
What it is
The N4 is the heaviest build of the platform: shore or barge mounted, throttling in stages against a dissolved-oxygen setpoint, with the oxygen-concentrator option for water that carries a real load (the measure of that load is BOD, the oxygen the waste itself demands as it breaks down, and lagoons run high). Oxygen comes from ambient air, which matters on a farm: no gas bottles, no delivery schedule, no supply contract riding on a back road in January.
The full platform story, from the sensors to the safety hardware, is on the N-Series page.
Odor is chemistry, and chemistry is measurable
The smell a neighbor complains about is made at the bottom: when the sludge blanket runs out of oxygen, anaerobic biology produces hydrogen sulfide and its relatives, and the wind does the rest. The N4 delivers oxygen at that layer, which is how the source gets removed rather than masked. We state that as mechanism, consistent with published research; what happens on your lagoon publishes as ranges and gets measured weekly, because that is the standard every claim here has to pass.
Built for the dirtiest water we serve
Lagoon water is the design case, not the edge case: no moving parts in the water path, no fine membranes to clog, smallest passage about 6 mm and self-clearing. The one wear part is a plate that swaps in under five minutes. Uptime is a design goal with a number attached in the record, not an adjective, and the unit reports its own faults before you see them.
Engineering targets
Every figure marked "target" is an engineering target for units now in build. Targets are published so you can plan, not to impress you; they can move during production, and the measured value replaces each one when units ship. Changes are logged where the number lives.
| Specification | Value | Claim |
|---|---|---|
| Coveragehigh-BOD lagoon duty | 1-10 acres | target |
| Mounting | shore or barge | by design |
| Output controlto a DO setpoint | staged | by design |
| Sensorscalibration-tagged | DO, temp, pH, ORP | by design |
| Oxygen concentrator | factory option | by design |
| Enclosure | NEMA 4X (IP66) | by design |
| Telemetryworks offline 30+ days | cellular, included | by design |
What it targets to cost
$55,000-85,000target
The band covers the unit; site work, installation, and Stewardship price with the lagoon, in the proposal. It is a target under the same rule as the table above: it can move during production, and published ranges tighten as the first installations price out. What actually sets the price is on what it costs.
Questions operators ask
How long before the smell changes?
We publish timelines as ranges because that is what is true, and lagoon loads vary more than pond loads. The mechanism is not mysterious: the odor compounds form where the sludge blanket has no oxygen, and the N4 works at exactly that layer. What we promise is the measuring: a dated baseline, weekly readings, and if the curve is not moving, you hear it from us first.
Will it survive lagoon water?
It is designed for exactly that water. No moving parts in the water path, no fine membranes, smallest passage about 6 mm and self-clearing, so solids pass through instead of accumulating. The one wear part is a plate that swaps in under five minutes during a routine visit.
What do I show an inspector?
The continuous record: dissolved oxygen, temperature, pH, and ORP, each reading tagged with the calibration record of the sensor that took it, dated, exportable. It is the same defensible format we publish for every water body, and it is yours.
What does it need from the site?
A mounting position on the shore or on a barge, power appropriate to the duty, and access for service visits. The assessment walks the site, sizes the electrical scope, and puts all of it in the proposal in writing before you commit.
What happens when it needs service?
Stewardship carries the visits, and the unit reports its own condition: alerts for faults, low oxygen, and power loss come to us over the included cellular link, which also works offline for a month or more and backfills the record. The design goal is the boring kind of machine; the record will show whether we hit it.
Tell us what your water is doing.
A specialist reads your description and replies with a plain answer: what it usually means and what we would measure first.