Most fab corner jobs are quick. Cut, drill, weld, ship. The Lansing aquaponic build was different — it took six weeks, sixteen visits, and a lot of conversations.
What they wanted
An indoor lettuce farm operating out of a 9,000 sq ft warehouse needed a complete reservoir and biofilter loop for their flood-and-drain media beds. Their first plan was custom fiberglass. The quote came back at $58,000. Their second plan was molded polyethylene tanks from an aquaculture supplier. That quote came back at $34,000.
They called us third. Could we build the whole loop from used totes?
The design
Four 330-gallon Grade C totes serving as the deep-water culture beds. Two 275s plumbed in series as the biofilter sumps. One 330 as the reservoir. One 275 as the nutrient hold. Custom plumbing between all of it. Total: eight totes, all reused, all reworked.
I went to the site three times before I cut anything. Their existing slab was uneven and I needed to know exactly where the totes could level out. They had a sprinkler system overhead and I needed to know the maximum tote height that wouldn't trip it.
The build
Week one was cutting and grinding. We cut the four DWC beds lengthwise to expose the planting surface, then welded a stainless cap around the rim so the lettuce roots wouldn't snag on the original HDPE edge.
Week two was plumbing. The biofilter sumps got threaded fittings drilled in at specific heights — water enters at 26 inches, exits at 8 inches. The siphon between sump 1 and sump 2 needed to be precisely engineered so the bell siphon would trigger at the right water level.
Weeks three and four were the reservoir and nutrient hold. Both got top access lids cut, valve fittings, and electrical pass-through for sensor probes.
Weeks five and six were on-site assembly. I drove down with a flatbed three times.
The total
$14,200 in tanks, parts, and labor. Roughly 24% the cost of their cheapest alternative. The farm reports the loop has been running smoothly for 28 months as of this writing.
Why I think about it
Two reasons. First, the entire reservoir and biofilter loop is made from material that was, three months earlier, being considered for landfill. That's a real thing in the world.
Second, the people who run that farm think about the tanks in their loop. They send me photos when they replace a pump. They've planted a small garden in the cage of one of the spare tanks I left them. The objects we make don't end up sitting in a corner; they end up cared for.
The best fabrication jobs aren't the cleverest cuts. They're the ones where the customer ends up curious about the object.