What if a life support system could give back more resources than it uses? On this episode of Inflow, hosts Joe Arlotto and Dr. Jeff sit down with Travis Snyder, Regenerative Manager at the Seattle Aquarium, to talk about how one aquarium is pushing past sustainability toward regenerative operations, and how aquatic animal life support systems sit at the center of that effort. Travis breaks down the Seattle Aquarium's regenerative goals, including a 25% reduction in both freshwater and seawater use by 2030, and the projects getting it there. He explains how on-site oxygen concentrators and oxygen saturation technology now deliver dissolved oxygen only to the habitats that need it, at about a quarter of the cost of delivered liquid oxygen. He walks through the all-electric Ocean Pavilion, which runs tropical habitats in a temperate climate without natural gas, using a sewer heat recovery reservoir, a tube and shell heat exchanger, heat recovery heat pumps, and heat gained from pumps and piping. The conversation also covers using VFD and SCADA data to cut pump energy, using rising tides to reduce pumping on the aquarium's natural seawater intake, backwashing freshwater filters with seawater, choosing HDPE over PVC, saving backwash water with activated filter media (AFM), and what climate change means for water temperature and dissolved oxygen in Puget Sound. Travis also shares his unusual path to the role, from a renewable energy degree and wind farm internships to aquarist and LSS positions at Monterey Bay Aquarium, OdySea Aquarium, a cephalopod research facility in Woods Hole, the Greensboro Science Center, and Cheyenne Mountain Zoo. He closes with a look at new denitrification loops, a custom lanthanum chloride system that has brought phosphates down to 0.04 to 0.05 ppm, and his advice for anyone who wants to bring sustainability into LSS: be curious, stay humble, and learn from other industries. Whether you're an LSS operator, designer, facilities manager, or zoo and aquarium leader working toward sustainability goals, this episode is full of practical ideas for cutting energy, water, and chemical use without compromising animal welfare. This episode is sponsored by Aquatic Equipment and Design and MAT LSS. Thank you for supporting Inflow and the LSS community. Inflow is the podcast where we discuss all things related to aquatic animal life support. Subscribe, leave a review, and find more episodes, show notes, and sponsor info at https://inflowlsspodcast.com/. (0:32) Why Sustainability Matters in LSS (3:11) Guest Introduction: Travis Snyder of the Seattle Aquarium (3:36) What Does "Regenerative" Mean? (5:04) Toward Carbon Neutral LSS: The Oxygen Concentrator Project (8:14) Delivered vs. On-Site Oxygen: The Cost Difference (9:45) Feedback Loops and Oxygen Saturation Technology (11:24) The Seattle Aquarium's Regenerative Goals (13:08) Reducing Freshwater Use Along the Salmon Journey (15:40) Backwashing Freshwater Filters with Seawater (18:36) Energy: The All-Electric Ocean Pavilion (20:37) Sewer Heat Recovery: Reusing Warm Discharge Water (23:40) Free Heat from Pumps and Piping (26:00) Heating and Chilling Loops in the Habitats (28:35) Using SCADA and Control System Data (29:52) VFDs, Amperage, and Pump Energy (31:35) Using the Tides to Save Pumping Energy (32:35) Keeping Equipment Rooms Cold: A Lesson from SeaWorld Abu Dhabi (33:55) Heat Recovery Heat Pumps (35:31) Tidal Head and Changing Seawater Demand (37:52) Climate Change, Water Temperature, and Dissolved Oxygen (40:51) Equipment Selection: HDPE vs. PVC (45:08) Activated Filter Media and Backwash Savings (48:14) Travis's Background: From Renewable Energy to Life Support (52:34) A Culture Shift Toward Regeneration (54:05) Designing for Future Goals and Denitrification (55:35) Phosphate Control with Lanthanum Chloride (59:54) A Future Panel on Lanthanum (1:00:14) Advice: Be Curious and Collaborate (1:02:33) Final Thoughts from Dr. Jeff (1:03:23) Outro and Sign-Off