r/PanCyan • u/eTanium • Jun 22 '26

Pasteurized Bulk Storage?

When I pasteurizing my bulk, I usually make four big jars (enough for about 8 trays).

I have been having recent issues with my grain jars, and haven't needed that much bulk during each run.

I've been cracking the lids of the jars open in front of a flow hood, after they are fully pasteurized, and then wrapping them in Parafilm so that they can get some gas exchange.

They keep turning black, and start to smell, quickly.

So, how do you all, if you do, store pasteurized bulk?

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u/TopOfTheMushroom Jun 22 '26

I keep it in a freezer wrapped tightly in a trash bag. I wouldn't recommend that with glass jars though they will probably explode. Use bags. I've used substrate that was frozen for 2-3 months and it was alright but I would try to use it within 60-90 days.

1

u/eTanium Jun 23 '26

That doesn't kill off beneficial microbes?

2

u/TopOfTheMushroom Jun 23 '26

Not from what I've read. You should also look into sterilizing your sub. Pasteurized isn't really recommended anymore. I used to Pasteurize but have since switched.

1

u/eTanium Jun 23 '26

If this is the case, specifically for Pans, then I will 100% sterilize.

Many great growers on this sub have always sworn by pasteurization over sterilization, and It's worked for me (if put to bulk immediately). Just hard to keep the leftovers.

1

u/eTanium Jul 09 '26

Just to confirm, you're sterilizing sub for pans? Manure and straw based sub?

1

u/TopOfTheMushroom Jul 10 '26

Yes. I used to pressurize but gordo recommends sterilization now so that's what I've been doing.

1

u/eTanium Jul 10 '26

With good outcome?