Why Second-Fill Rate Is the Metric That Matters

Diversion tonnage is a vanity metric

A reconditioner can move the diversion-tonnage number simply by accepting more tanks at intake. If those tanks then go to grind instead of back into commercial service, the carbon math is much weaker than the press release implies. Recycling HDPE is good; reusing the same tank is dramatically better.

Second-fill rate captures the real story

Second-fill rate is the percentage of incoming tanks that return to commercial service as filled IBCs (versus being parted out, ground for flake, or otherwise rerouted). A 94% second-fill rate means that 94% of incoming tanks displace a new-tank purchase somewhere downstream. That is the actual carbon impact.

What pushes the number

• Intake discipline — refusing tanks whose chemistry or condition would force them out of reuse.
• Reconditioning process quality — a wash line that returns tanks to spec rather than punting them to a lower grade.
• Outbound demand pipeline — second-fill needs buyers who will actually take the unit. Programs with weak sales funnels see lower second-fill rates regardless of operations.

What we track and report

Second-fill rate, by month, on the wall of our operations office. It moves slowly — a few percentage points across a year. But it is the leading indicator of every other sustainability number we publish.