The mechanism, the permit, and who else reads the instruments.

What the physics gives you, and what it costs to size

Below roughly 1,000 nanometers a bubble stops behaving like a bubble. Buoyancy no longer dominates, surface charge keeps neighbors apart, and the interface available for gas to cross into water becomes enormous for the volume delivered. That is why a treatment stage with this capacity fits on a hull.

The 1.5 result in the table is one rig, one water, one measurement, and a laboratory one. Other comparisons in the aeration literature report higher multiples from different setups. A fleet sized against the higher figures is cheaper on paper and has a thinner margin when a bad August arrives. A program is sized against the conservative end.

The two NOAA releases, and the four letters

Neither NCCOS release concerns a SeaBreather. The 2018 work names a system called NABAS. The 2020 system is NBOT, Nanobubble Ozone Technology: the same four letters as Nano Bubble Oxidation Technology, on another owner's hardware and a different duty. Together they show the approach clears its target in a pond and a ballast tank without poisoning the receiving water.

Work done under a completed NOAA agreement

Alarivean completed the term of a Cooperative Research and Development Agreement with NOAA, entered through AMURI. That term has ended, and no CRADA is running today. CRADAs are private instruments and are never posted, so no public copy exists. Work under it with the agency scientist Dr Peter Moeller established that the treatment sterilizes a toxin by disabling the functional groups responsible for the toxicity. The dangerous part of the molecule is taken apart where it is, leaving no precipitate on the bed and nothing to lift out.

Dr Moeller continues as an advisory and verification voice on the research, a looser arrangement than an agreement.

The original CRADA was built around one nanobubble generator that the research has since left behind. Later research has run with Arizona State University — Dr Sergi Garcia-Segura, Dr Jesús Morón-López and colleagues — with the Middle East Desalination Research Center, and with more. Those facilities suited the next scale the company wanted to test.

Dissolved metals follow the same rule. Oxidation reaches the toxicity attached to the metal; the element is still an element after the pass, and no PFAS destruction is claimed anywhere in the program. A 2023 review of advanced oxidation and heavy metal complexes finds the ligand comes apart and the metal is released into solution, still present. It is wastewater work, mostly on one model compound, and nobody has taken it to open water.

Neither the agreement nor its completion amounts to an endorsement. NOAA does not endorse commercial products, has not been asked to, and has put its name behind no hull.

The Florida permit

In September 2024 Alarivean, Inc. received Florida Department of Environmental Protection permit FLOA00062, issued by FDEP's South District Office under Chapter 403 of the Florida Statutes with a five-year window, to field-test an ozonated-seawater craft producing 1,000–2,000 gallons per minute for red tide mitigation. The trial is conditioned on active Karenia brevis above 100,000 cells per liter.

That craft is a modified personal watercraft, a fraction of the size of a SeaBreather hull. Its permitted flow describes that trial vessel and nothing about the class.

Two outside bodies documented it: the Sarasota Bay Estuary Program, which gave the application technical support and deliberately no money, and the Florida nonprofit START. The estuary program's public position is that efficacy in open water is unproven.

The estuary program has asked for the measuring role once open-water work begins, so any claim past the mouth of the bay rests on its own scientists' readings. Alarivean has asked for the same.

Bromate, and whose limit applies

Ozone finds the bromide in seawater far more readily than the chloride, and the hypobromite that follows can go on to bromate. So an oxidation duty runs enclosed, with a probe on the water going in and another on the water coming out. Bromate is a stable end-product and cannot be quenched once it exists. Governing its formation is the whole job.

No fixed number for it is published. The binding value is the one for the receiving water, agreed with the consenting authority and written into the service level agreement before a system deploys. A drinking-water standard is a poor test for open sea, and a desalination intake already carries bromate handling of its own.

Formation is assessed per water body. It needs a bromide threshold that salt and brackish water do not always meet, bromide competes with the dissolved carbon for ozone, and the rate tracks pH, temperature, dose and residence time. The control is engineered in at the source. Independent laboratory work confirms what real-time instruments cannot see, and reporting runs to the regulator that issued the permit. The client reads the same feeds and can hold an active deployment on any suspected infraction until it is cleared to their satisfaction.

The two open questions

Radical chemistry. Moleaer and Arizona State University reported reactive oxygen species from injected nanobubbles in 2020; a controlled 2023 study by Chae and colleagues in ACS ES&T Engineering found generation minimal, if it occurred at all, at ambient conditions. No part of a SeaBreather program is costed on radical chemistry.

Open-water efficacy. No open-water result has been published by this platform or by a competitor. What exists is pond scale and ballast-tank scale. Calibration gives a client a number on their own water: a bounded area, viability parameters agreed in writing beforehand, an independent institution taking the readings. A figure for a named bay follows the site read, with its assumptions printed.

A subscription is written against a performance specification, and performance outside it ends the subscription. After the minimum subscription period an unconvinced client can end it too, with no reason required.