Steam-catcher odors--malt-related?

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mongoose33

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I bought a steam catcher from BobbyM a couple years ago--very happy with it with one small complaint--the very strange odor that emanates from the system when using it. It's at worst a minor annoyance, something the ability to brew in my garage in the winter overcomes easily.

I'd given up hoping there was an answer (and if there is one and I missed it, please sing out). But something weird happened the last time I brewed.

The odor was much, much more tolerable than ever before. Typically that odor would last through the next day and we'd smell it every time we entered the garage. I often had a comment from SWMBO if I had the door open from the garage to the house. But last time? I wouldn't say it was imperceptible but it was well below the level I've ever had before. The next morning? Couldn't smell it at all.

Here's a theory, one I hope we can confirm or debunk: I almost always use Maris Otter as a base malt in my brews. Love the richness! I have some brews where MO and Munich malt form the backbone.

Last time, the recipe didn't call for MO--some 2-row, some Pils, a couple tiny bits of adjunct, but no MO.

The question that's on my mind: is the odor related somehow to the type of malt used? Are there elements in the wort that, depending on the malt used, make that odor much worse or much better?
 
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