It took two days of detective work to track down the suspect that led 10 Barrel Brewing Co. to recall two of its brews, Swill and Beer #1.

The culprit: an enzyme used in the brewing process, the brewery announced on Facebook.

“After two days of continuous testing, researching, and investigating by our entire team (including outside help), we have been able to discover the root cause of the issue,” the post states. “We used a unique and specific enzyme in the brewing process thats purpose is to break down complex starch strains and reinvigorate early fermentation in some of our sour beers.”

On Wednesday, the Bend brewery declared a voluntary recall on 12- and 22-ounce bottles of Swill due to secondary fermentation that caused the beer to gush out of bottles and glass bottles to break.

Garrett Wales, partner at 10 Barrel, said the brewery nailed down the cause around 9:30 p.m. Thursday.

“That enzyme is one that’s not essential by any means to any of our beers,” he said Friday morning. “It’s out of the brewery, and it will never be touched again.”

The brewery’s small-batch cherry tart beer, named Beer #1, was brewed with the same enzyme, so the brewery began asking consumers Thursday night to dispose of it as well. However, Beer #1 was released earlier this year, so Wales believes there is none left in the distribution network or in the marketplace.

Swill, the brewery’s second largest seasonal seller, caused the brewery and its customers a lot of headaches and won’t be returning to shelves, Wales said. He is still unsure if it will be back next summer.

“There’s definitely been a hit to the Swill brand,” he said. “It’s significant, but at the end of the day it doesn’t matter. We had to make the right decision, and that was an easy decision to make.”