Bloomreef is built under Subtral, a parent company for planetary-restoration ventures. We keep each venture separate on purpose — different technology, different partners, different pace — but we think you deserve to see the whole picture, not just the part with its own website.
Every page on this site tells one coherent story: modular ocean towers, seaweed and coral, restoration that pays for itself. Our sister venture works in a completely different physical world — buildings, not the ocean — with different regulators, different partners, and different engineering entirely. Keeping them separate isn't about hiding anything. It's about giving each one the focused credibility it needs with the specific people evaluating it, rather than asking a marine research institute or an ocean-tech investor to also evaluate an unrelated building technology in the same conversation.
AlgaVein is a building-integrated microalgae system: transparent tubular photobioreactors running along rooftops and select exterior surfaces, circulating a living culture of fast-growing microalgae that absorbs CO2 — ideally drawing directly from a building's own HVAC exhaust — and produces harvestable biomass in the process. Where Bloomreef restores the ocean, AlgaVein is designed to turn ordinary concrete buildings into net-positive contributors instead of net emitters.
Current focus: biofuel, deliberately, not food. Microalgae grown on a city rooftop is exposed to urban air pollution and HVAC exhaust — exactly the conditions that make it a poor candidate for human food or animal feed, but a perfectly reasonable one for biofuel, where the purity bar is fundamentally different. That's a real, honest engineering constraint, not a limitation we're glossing over — it's the reason AlgaVein's primary product path is biodiesel and renewable fuel precursors, not protein.
Nothing is wasted, even after fuel extraction. Once oil is extracted from harvested biomass, the leftover "algae cake" is still organic-matter and nitrogen-rich — a genuine feedstock for vermicompost and soil regeneration, the same downstream story already central to Bloomreef's own Green Wall work. Two different ventures, two different primary products, one shared final destination for what's left over.
Where the real synergy is — not a shared brand, but shared research. Light, CO2, and nutrient optimization science transfers meaningfully between microalgae in a tube and macroalgae in open water, even though the organisms differ. A promising early data point: a 2025 student research project (Society for Science finalist Arya Hirsave) found that a simple 5-day protocol — vitamins for three days, then high salt stress for two — increased lipid yield in Chlorella vulgaris by 77% while the culture kept growing. It's exactly the kind of low-cost lever worth testing directly in an early AlgaVein pilot.
We're not pretending this is further along than it is. AlgaVein is design and patent-structure work on paper — there is no physical pilot yet. The closest real-world precedent, Hamburg's BIQ House (2013), proved building-integrated algae facades genuinely work: 129 bioreactor panels, real carbon capture, real heat generation. It's also an honest caution — it cost roughly $6.5 million, needed major engineering partners, and remains one of very few examples built anywhere in the world more than a decade later. Scaling this is a real, hard problem, and our own first pilot will start far smaller than a full building facade — a single small rooftop rig, not a building-wide retrofit.