PF Tek advice

Morbid Angel

Well-Known Member
Need some advice.

First time doing pf tek. Sterilized 12 1/2 pint jars at 15psi for 90 min. BRF cakes with vermiculite. They have cooled for a few days. They all have two self healing injection ports no gas exchange membrane.

Here is the thing. The jars all had negative pressure. When I put the needles through the ports the - pressure was so great it would pull fluid into the jars depressing the plunger.

I have two questions:

1) can the mycelium handle that negative pressure and lack of oxygen?

2) should I put a filter over the plunger port of an empty syringe and let some air be injected into the jars through the ports?


havnt found anything online.
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As I have your attention anyhow here’s a bonus question.

I’m using pot barely for grain jars. After a 24hr soak and a ten minute (in coffee infused water) boil I rinsed in cold water very well and let drip dry for ~20 min getting all moisture off before spooning into jars. Grains where not sticky. After 90 min at 15psi the grains where all stuck together in the jar but loose at the top few inches. There is no pooling water at the bottom of the jars. Grains are moist but I will not be able to shake loose kernels come 25% spread of mycelium.

next time I would like to be able to shake the grains.

what should I do to maintain loose grains in my jars?

38A3B3AD-5A2C-44BC-A905-52D3297C6C6F.jpeg
 

canndo

Well-Known Member
If you have a pressure cooker, why not try my approach. It says pf but an essential for that is some sort of gummy concoction of flour and vermiculite.




Negative pressure is not good, they need a degree of oxygen that will more quickly be depleted in less than one atmosphere.

Your picture looks like you can shake it easily enough. You may have to bang the jar against something few times to break it up.

NOT your hand. Yeah I know we do it but if you get carried away and fail to notice a fracture in the glass all that blood from your wrist will spoil your project.

If you cook the grain in the jar while autoclaves, try putting a teaspoon or two of gypsum in there, it should help break it all up.
 
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