Big water problems require persistent care.
Which stressors you carry sets the vessel tier, the number of hulls, the indicators in the agreement and what the subscription costs.
Big water problems
One estuary receives all of these at once.
They arrive together and compound. A bloom rides in on a nutrient load, the oxygen deficit follows it down the column, and a harbor master gets all three in the same August.
Stressors include
01 — Dead zones
Oxygen missing from the layer that lost it. The duty the fleet was built around.
02 — Harmful algae
Cells double faster than procurement moves. The hulls have to be inside the zone before the forecast is.
03 — Nutrient loading
A cause that arrives from land on a decades-long clock, and a firewall you can put at the inflow now.
04 — Heat stress
Upstream of the deficit and the bloom. A nanobubble cloud shades as much water as the fleet is sized for, never a whole sea.
05 — Harmful emissions
Methane and nitrous oxide a treated water body stops making, set against the energy a program burns.
06 — Microbial consortia
Ballast tanks, quarantined basins, treatment trains. A dose that meets a boundary.
07 — Hydrocarbon leachates
Fuel residues, tars, and additives off degrading plastic. The reactor reaches what has dissolved; the polymer stays untouched.
08 — Heavy metals
Left dissolved, and kept off your dredging schedule. The boundary here matters more than any claim.
Who carries it
09 — Public health
WHO publishes three microcystin values for three different exposures. The notice quoting one of them is signed by somebody who does not work here.
10 — Marine life
Not a beneficiary category. The instrument that tells you whether the water changed.
11 — Blue economy
Two and a half decades of growth measured in output, with no series for the condition of the input.
In the planetary boundaries framework, several of these headings are control variables a strategy desk already reports against: nutrient loading under biogeochemical flows, the leachate category under novel entities. The mapping is ours; the crosswalk between the two vocabularies is at Aquatic Prosperity. Acidification sits beside 05, harmful emissions, and no program treats it.
01 — Dead zones
Oxygen is the deficit that arrives on a calendar.
Hypoxia is seasonal, it is driven by heat and stratification, and it forms in the part of the water column that surface aeration does not reach.
NOAA sets the hypoxic line at 2 mg/L of dissolved oxygen. That is a definition, not a target: a review of sensitive species in the Delaware estuary put the lethal-level requirement between 4 and 6.4 mg/L. Water at 2.5 mg/L is not hypoxic and still kills.
In 2025, a comparatively good year, the Gulf of Mexico zone measured 4,402 square miles, the fifteenth smallest in thirty-nine years of records. Worldwide, Diaz and Rosenberg counted more than 400 coastal dead zones in 2008.
The vessels were built around this duty. Water is drawn from the layer that has run out, taken through the reactor aboard and returned to the same depth carrying oxygen, held continuously, with the readings reaching somebody outside this company when they reach our crew.
02 — Harmful algae
A bloom is a deadline with a color.
Most stressors can be worked on in your own time. This one cannot. Cells double, wind pushes the patch, and a treated week is decided before most procurement departments have opened a file.
What works against algae is presence: hulls already inside the service zone, gas already contracted, crews already accredited to that regulator, and a scope naming in advance which stressors the subscription covers. When a forecast lands, the response is a course change. Presence cannot be bought at short notice, so it is sold as a year-round subscription, and holding it costs less than the same hulls chartered in an emergency. Blooms forming outside the boundary are intercepted under the same arrangement, wherever the feature sits, because a patch upwind is yours within days.
The toxin is the half that closes a beach after the water has gone clear, so the measurement obligation runs on the toxin assay a health directorate acts on. Bloom water is worked inside a contained reactor, the cells come apart inside the hull, and what returns to the patch has been sampled at the outlet. The flow never stops; there is nowhere aboard to stop it. Toxin work is the tier above: settings held further back from the line, oversight closer in, and instruments that shut the oxidant or the intake before a discharge can leave outside its figure.
Work under this company's now-completed research agreement with NOAA established that the treatment takes the toxin molecule apart inside the reactor and leaves nothing to settle on the bed. The finding is ours and unpublished, and a research agreement was never an endorsement. More on the treatment stage; HABslayer runs the duty.
03 — Nutrient loading
Fixing runoff sources may take twenty years, and should still be started.
Two clocks run here. Cutting what leaves the land is the long answer. Intercepting the loading dynamic where it enters the water is available now.
The Baltic shows both. Nine countries agreed reductions, delivered a large part of them, and had them audited: against the 1997–2003 reference period, normalized nitrogen input was down 11 percent by 2022 and phosphorus down 32 percent. The Baltic Proper and the Gulf of Finland still failed their maximum allowable input for both nutrients, and the hypoxic area of that sea has gone from under 10,000 square kilometers before 1950 to more than 60,000 since 2000.
That is lag. Nutrient already in a system keeps cycling long after the tap is turned down, and the years between policy and recovery have to be got through with the water there is.
The oxidation and aeration firewall that protects a coastline from what arrives on the tide can also be set at a runoff hotspot, on the inflow itself, to mitigate the loading dynamic before it spreads outward. Dr Peter Moeller of NOAA observed an effect on nitrogen and phosphorus in this work. We are still studying it, and no number is published. The effect does not switch off when the catchment program lands.
None of this is an argument against fertilizer. Fertilizer feeds people, and a plan that starves growers to save a bay moves the harm somewhere less photogenic. Keep optimizing agriculture (fewer harmful pesticides, the right quantity of nutrient in the right place) and handle the runoff where it enters the water, which is cheaper and faster than throttling how food gets grown. HAB Control covers writing both clocks into one strategy.
04 — Heat stress
Heat gets there first, and the rest follows it in.
Warm water carries less oxygen and resists mixing, so a thermal event usually sets up the deficit and the bloom that arrive after it.
The sequence rarely varies. The column caps, the layer beneath stops being resupplied and spends what it had, and a bloom finds the warm, still skin it wanted. By the time a bleaching alert or a fish kill reaches a newsroom, the heat that arranged it has peaked.
Part of what a program carries against this is shade. A nanobubble cloud laid over the water works as an albedo effect: countless gas spheres between the sun and everything beneath, each turning back a share of the light before it becomes heat in the column. The area under that cloud is set by how many hulls are on it, and nothing in the physics caps it. One hull covers a shellfish nursery; several cover a long run of reef through the exposure window. A client holds us to the state of the water and the safety parameters around it, read live by instruments and by an institution that does not answer to us.
No program of ours turns a regional thermal signal around. That forcing is made elsewhere and arrives whatever floats on the water, and the contract says so. Cover is answered in hulls. Where the signal is basin-wide, breaking a stratified cap alone does little, though shade over the reef, the nursery or the intake ground is available wherever hulls can go. Where the water that would have to sit under cloud costs more than the losses it would avoid, we decline to sell it, and the site read says so before anybody drafts a contract.
No cooling figure is published, in degrees, area or duration, because none has been measured on your water yet. The first comes out of the calibration phase on site. ReefHealer carries the reef case and its limits.
05 — Harmful emissions
Both sides of this ledger get counted, and one of them is larger.
A hull burns fuel getting to a zone and runs industrial gas once there. That footprint is real, and it is quantified during the site read.
The other side is emission that never happens. An anoxic water body is a methane source, as a basin like Lake Erie is in a bad August, and a nutrient-loaded coast is a nitrous oxide source, like the water off Lima. Restore the oxygen and that production never starts, so nothing has to be bought elsewhere to cancel it. In those settings the systems consume far less than they avoid, and the avoided emission would qualify as premium nature-based avoidance measured in CO2 equivalent.
Alarivean is eligible for climate finance where the case supports it, and would structure a program that way. We do not measure our own avoidance and then sell it. A credit has to be quantified by somebody with no stake in the treatment, against a protocol agreed before the work starts; that separation is the argument behind Credible Exchange. No tonnage is claimed and no credit has been issued.
The adjacent chemistry is public record and makes no claim about our equipment. NOAA reports aragonite saturation down by about a fifth across much of the surface ocean.
06 — Microbial consortia
Organisms inside a volume somebody can draw a line around.
Organisms held in a bounded volume (a ballast tank, a quarantined basin, a treatment train) respond to a controlled oxidant duty, and the measurement cited for it belongs to an outside laboratory. NCCOS-affiliated testing in 2020 evaluated a commercial nanobubble ozone system on ballast water and found it effective against algae, bacteria and motile zooplankton, with no statistically significant adverse residual toxicity in the receiving water.
That testing was run on another company's equipment; the evidence records what it establishes. A contained reactor treats what passes through it, so this duty is priced by the metered volume through the reactor.
The regulatory frame is the IMO's ballast water convention, in force since 8 September 2017, with a discharge standard of fewer than ten viable organisms per cubic meter at 50 micrometers and above. The largest organism class, resting cysts and large zooplankton, is the most oxidant-resistant and is not claimed on a single immediate-discharge pass. ChemSlayer runs that duty.
07 — Hydrocarbon leachates
Petroleum-derived material leaches for as long as it sits there.
The category is the dissolved fraction: compounds that leave a material and go into the water around it. Fuel and oil residues worked into a sediment. Tars. Weathered bunker traces along a bulkhead from a release nobody logged. And the additive load coming off plastic breaking down in place, one case inside the category.
A crate on a seabed. Film wrapped around a mooring chain, pellets that went over a side in 2019, sheeting piled at the top of a beach by one winter and buried by the next. None of it moves quickly. The chemistry does: the additives that kept the polymer flexible, stable and colored come out into the water, season after season, while the object sits there looking inert.
A treatment stage reaches that leachate, and reaches the organic part best: the plasticizers, the bisphenols, the phenolic stabilizers, and the dissolved fraction of an old hydrocarbon load beside them. Advanced oxidation is built to take those apart. Affected water is drawn into the reactor at flow, treated on the way through, and handed back verified into the water it came out of. Nothing waits aboard, and a single pass is not a claim of complete mineralization.
The metal in a metal-based stabilizer or pigment stays; a metal is still a metal after oxidation. Where the additive is an organometallic, as plenty are, the organic half is reachable and the metal half is not, so the compound changes and the inventory does not. The plastic itself is untouched: nothing in a treatment pass degrades, dissolves or removes a polymer.
Recovery is a separate duty and a separate line in a scope. Floating and shoreline plastic inside a contracted zone comes out under the Beach Cleanse augment: a workboat, a crew and a written scope agreed before anyone quotes it. Where hydrocarbon is still arriving, the spill and contaminated-discharge duty sits with ChemSlayer.
Oiled ground is where that duty ends and a land system's begins. Once responders release a stretch of sand, shingle or marsh, the hydrocarbon chemistry still bound in it is worked in place by SoilScrubber, which gathers nothing and carries nothing away. No Alarivean program has run that duty on an oiled shore; the support for it is published work on advanced oxidation in petroleum-contaminated soils, and the first number for a given shore is measured on it.
The basis is Alarivean's own account of work carried out under a private research agreement with NOAA whose term has since ended. It has never been published. No agency endorsed it then and none endorses it now.
08 — Heavy metals
What happens to a metal decides who inherits it.
Two answers are on offer in this market, and they land on very different budgets.
Precipitation is a relocation. A metal that settles into sediment is still a metal: a dredging problem, a benthic problem and, in a shallow basin, one that returns the next time a storm or a propeller stirs the bed. A coagulate-and-settle answer leaves you holding exactly that.
Nothing is removed from your water. What gets neutralized is the chemistry that made a thing harmful, and a hydroxyl radical does not destroy a metal, so for a metal that means the organic groups bound to it. Reviewed work on heavy metal complexes describes the ligand coming apart and the ion being released, in industrial wastewater. Nobody has run that work on a bay. The species changes and the quantity does not.
Nor does oxidation push a metal out of solution onto the bed. Where a metal load is the problem a basin actually has, the site read says so in week one.
09 — Public health
A health authority should be holding the same readings we are.
In August 2014 a bloom on Lake Erie reached Toledo's intake, and roughly half a million residents were advised not to drink the tap water. NOAA Fisheries puts the shoreline property-value loss at $10.05 million. A public official signed the notice. No contractor signs one of those.
Guideline values do damage because there is rarely just one. WHO publishes three for total microcystins: 1 microgram per liter for lifetime drinking-water exposure, 12 for short-term, 24 for recreational water. Quote only the first and a directorate issues a do-not-drink notice WHO's own guidance does not call for. Quote only the last and the opposite happens.
Some exposure never reads on an intake meter. Aerosolized brevetoxin from red tide produces an upper-respiratory syndrome, and asthmatic subjects in one study reported symptoms up to at least five days after a single hour of exposure. Domoic acid has no antidote and is not destroyed by cooking or freezing.
Independent oversight
The health authority that signs the notice should not be waiting on our report. Local scientific institutions hold the live feeds from the situation report onward, so a second copy of the record exists outside this company from the first reading. How that arrangement works.
10 — Marine life
The measurement that decides whether the water actually changed.
Biology is the one reading our own equipment cannot produce, so it is the one worth contracting somebody else to take.
Kuwait Bay, August and September 2001: more than 2,500 tonnes of wild mullet, roughly a hundred times a red-tide-linked kill two years earlier. The peer-reviewed account attributes it to bacterial disease, harmful algae and eutrophication acting together, in one bay, in one month.
Between January 2023 and March 2025, bleaching-level heat stress reached 84 percent of the world's reef area across 82 countries. And aquaculture passed capture fisheries in 2022, at 94.4 million tonnes against 92.3 million. Half the world's aquatic protein is grown in water somebody has to keep alive by design. ReefHealer covers the reef duty and its limits.
11 — Blue economy
Thirty years of output measured, with no series for the condition of the input.
The OECD puts the ocean economy at US$2.6 trillion of gross value added in 2020, double its 1995 figure in real terms, and it would rank fifth in a table of national economies. Marine and coastal tourism is projected to be its biggest sector by 2030, at US$777 billion and more than 8.5 million jobs.
The series has no line for the condition of the water while that value was produced. So the cost of a bad season lands scattered across cancellations, membrane replacement, throttled output and closed harvests, never under a heading anyone budgets against.
A cost with no heading still gets paid, in pieces, by whichever sector fails first, and everything bought during an event is bought without leverage. A subscription running beforehand puts that money under a heading, at a rate that exists because the work is preventive. Nobody is charged for foresight. They are charged less for having it.
Marine Prosperity carries the institutional case for preventive spend; AquaProsper carries the operator's.
Where the stressor becomes a place
Three water types, and the difference between them is time.
The same deficit behaves differently depending on how long the water stays put. That changes the treatment, the owner, the regulator and the price. It does not decide whether a water body can be held at all.
Asked in the first meeting
Three that arrive by return
We have three of these problems at once. Is that three programs?
One. A single zone carries the vessel tier, the gas supply and the augments on one subscription, and the duties run from the same hulls in the same weeks.
The scope names which stressors sit inside it and which outside, in writing, before anything is signed. Adding a duty later is a priced variation with the same sign-off.
We have plastic accumulating in our bay. What would a program do about it?
A pass reaches what has leached out of the plastic: the plasticizers, bisphenols and phenolic stabilizers, taken apart in a contained reactor aboard. The metal in a metal-based additive stays a metal, though the organic half of an organometallic is reachable. The polymer itself is unaffected.
Floating and shoreline material is recovered under the Beach Cleanse augment: a workboat, a crew and a written scope. The two are separate lines with separate costs.
Do metals come out of the water, or end up in our sediment?
Neither. The reactor neutralizes the organic chemistry bound to a metal, so the form changes and the quantity your water holds does not.
Nothing drops onto your bed either. If the metal load is your actual problem, the site read will say we are the wrong instrument.
Sources
- NOAA NCCOS — Below-average summer 2025 dead zone measured in the Gulf, July 2025.
- NOAA NCCOS — Hypoxia research program.
- Delaware River Basin Commission — Review of dissolved oxygen requirements of key sensitive species, November 2018.
- VIMS — Chesapeake Bay dead zone report, December 2025.
- Diaz & Rosenberg, Science — More than 400 dead zones worldwide, 2008.
- NOAA Fisheries — The untold story of harmful algal blooms.
- Alvarez et al., via Newsweek — Florida's losses from red tide, January 2024.
- Reviews in Aquaculture — Global fish-killing harmful algal blooms, 2024.
- HELCOM — Inputs of nutrients to the Baltic Sea, indicator update 2025.
- Hypoxia in the Baltic Sea: biogeochemical cycles, benthic fauna and management, 2014.
- NOAA PMEL — What is ocean acidification?
- NOAA Ocean Acidification Program — Acidification is more pervasive than previously thought.
- NOAA NCCOS — Nanobubble ozone technology and ballast water invasive species, July 2020.
- IMO — Implementing the ballast water management convention.
- NOAA GLERL — Great Lakes Aquatic Nonindigenous Species Information System, 2019.
- WHO — Microcystins background document for drinking-water guidelines, 2020.
- Fleming et al., via PMC — Aerosolized red tide toxins and asthma.
- California Department of Public Health — Domoic acid fact sheet.
- Harmful Algae — The 2001 Kuwait Bay fish kill.
- NOAA and the International Coral Reef Initiative — The fourth global coral bleaching event, 2024–2025.
- FAO — The state of world fisheries and aquaculture 2024.
- OECD — The ocean economy to 2050, March 2025.
- OECD — The ocean economy in 2030, 2016.
One water body at a time
Which of these is actually yours?
Send the water body, what goes wrong in it, which months, and what a bad season costs. We will say which heading it belongs under, including when we are the wrong instrument.