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BlueAndOrange
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PC didn’t go so great, how do I determine usability
#27818696 - 06/14/22 12:14 AM (2 years, 7 months ago) |
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I PC’d 10 quarts of milo tonight. I put enough water to cover the trivet in the presto 23 quart, and let it run for 5 minutes venting steam, put on the weight until it hit 15psi, and turned it down to 7 (induction stove that goes 1-10) where I usually PC my grains. I noticed after 90 minutes the rocker stopped rocking but the pressure was still 15psi. I let it sit 10 more minutes like this then killed the heat. Rocking the rocker manually let out steam and little balls of water onto the lid.
At the 2 hour mark the pressure was down to 5psi. 2 hours was my target time at 15psi.
So how do I evaluate if this grain is usable? Do I just dump it and start over? I’m more concerned with wasting my colonized agar then my jars of grain. Any help is appreciated.
Probably should have added another inch of water.
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Goatrider
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Re: PC didn’t go so great, how do I determine usability [Re: BlueAndOrange] 1
#27818727 - 06/14/22 12:53 AM (2 years, 7 months ago) |
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The manual reads 3 quarts of water. Did you rise the trivet or?? Venting for me at least 10 minutes, better 15. The rocker should rock the full cycle a few times, unless you modified it with extra weight to rise up to ~17-18psi. You may re-sterilize the jars, but i don´t know about your moisture content.
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Baba Yaga
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Re: PC didn’t go so great, how do I determine usability [Re: BlueAndOrange]
#27818728 - 06/14/22 12:53 AM (2 years, 7 months ago) |
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You are suppose to put 3 quart of water in.
Don't know if your grain is usable, I would be more concerned about the state of your PC. I would check if the bottom of your cooker isn't warped.
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BlueAndOrange
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Re: PC didn’t go so great, how do I determine usability [Re: Baba Yaga]
#27818960 - 06/14/22 08:02 AM (2 years, 7 months ago) |
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Well, I just got up and looked at things after cooling overnight. There is still a small amount of water in the PC. The bottom seems lightly warped. The grain looks good for moisture. The milo tek I ran says 90-120 mins at 15-20psi. I guess I’m going to try the grain and see if it grows clean. I saw so many posts about an inch of water being enough that I didn’t consider the manufacturer’s instructions.
I’m ordering a new PC. I don’t like the warping. I’m hoping the grain is adequately sterile, hydrated and not burned.
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redcrow

Registered: 03/25/22
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Re: PC didn’t go so great, how do I determine usability [Re: BlueAndOrange]
#27819123 - 06/14/22 10:28 AM (2 years, 7 months ago) |
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I make the same mistake with a Zavor brand PC and the bottom de-laminated.
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Healing Oakland
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Re: PC didn’t go so great, how do I determine usability [Re: redcrow]
#27819208 - 06/14/22 11:54 AM (2 years, 7 months ago) |
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Re PC the grain, it won't hurt the grain, and it's better than putting clean agar to grain that might not be fully sterilized. Vent longer (I'm talking once it starts hissing, then start the timer) 10-15 minutes like the other guy said, I even do 20 on my 75x's. And in my personal experience 90 is a BARE minimum at 15 psi, I go for 2+ hours at 17-20 psi (my AA75x's self regulate and bounce up and down in that range where I have the dial set). Also, let it cool down naturally, don't manually rock the weight to purge your pressure at the end of the cycle, it's all part of the protocol. Also, more water in the bottom and you can raise your trivet with jar ring lids. (Also, you have an induction stove, did you get the induction version of the presto?)
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milkboy
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Re: PC didn’t go so great, how do I determine usability [Re: Healing Oakland]
#27819330 - 06/14/22 01:29 PM (2 years, 7 months ago) |
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Why do you recommend raising the trivet? I dont typically lose much water running 2.5 hours at 17 psi with the proper setting, is there another reason?
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BlueAndOrange
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Re: PC didn’t go so great, how do I determine usability [Re: milkboy]
#27819438 - 06/14/22 02:26 PM (2 years, 7 months ago) |
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I re-prepped new grain jars today and put the right amount of water in the PC. Raising the trivet means I can’t fit 10 jars. I do have the induction version of the PC.
I only tipped the weight at the end to see if there was still steam in the PC, not to fully depressurize.
I’m worried if I re-PC the jars from yesterday they won’t have the right moisture content at this point, but I’ll PC again tonight and inoculate them and see.
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Healing Oakland
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Re: PC didn’t go so great, how do I determine usability [Re: milkboy]
#27819458 - 06/14/22 02:44 PM (2 years, 7 months ago) |
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Milk: I only mentioned how I have raised trivets in the past because Goat mentioned it, not that it's a necessity in this case.
Blue: Your jars should still be cool on moisture, they shouldn't have lost much if any through the course of a PC cycle. Besides, it's always better to have slightly drier grain than slightly too wet. For one reason or another, I've done two PC cycles more times than I care to admit over the course of the years I've been cultivating lol, they'll still be good. 
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san pedro guy
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Re: PC didn’t go so great, how do I determine usability [Re: Healing Oakland]
#27819556 - 06/14/22 03:54 PM (2 years, 7 months ago) |
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I always thought when a pc runs low on steam by the end of the cycle the water was escaping from everywhere inside…is there a reason the water would only evaporate from the bottom and not evaporate out of the grains??
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BlueAndOrange
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Re: PC didn’t go so great, how do I determine usability [Re: Healing Oakland]
#27819586 - 06/14/22 04:17 PM (2 years, 7 months ago) |
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Quote:
Healing Oakland said: Milk: I only mentioned how I have raised trivets in the past because Goat mentioned it, not that it's a necessity in this case.
Blue: Your jars should still be cool on moisture, they shouldn't have lost much if any through the course of a PC cycle. Besides, it's always better to have slightly drier grain than slightly too wet. For one reason or another, I've done two PC cycles more times than I care to admit over the course of the years I've been cultivating lol, they'll still be good. 

Awesome. Thanks. I’ll re-PC them tonight before bed. Between the 2 batches I’ll have 22 quarts prepped. I guess I’ll be doing some G2G to propagate since I don’t have enough agar colonized and just hope for the best. No sense in tossing it all out if this might work. Since I’m growing some nats and FP+ this time around, I wouldn’t mind bucket load of each.
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MushieMafia
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Re: PC didn’t go so great, how do I determine usability [Re: BlueAndOrange]
#27819628 - 06/14/22 04:42 PM (2 years, 7 months ago) |
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wow blue thats a lot of grain prep!
A bit weird that the rocker stopped rocking and that the pressure dropped to 5 PSI, good idea going with new grain
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Healing Oakland
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Re: PC didn’t go so great, how do I determine usability [Re: MushieMafia]
#27819740 - 06/14/22 05:58 PM (2 years, 7 months ago) |
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The rocker can stop because it doesn't need to release any pressure or steam to stay where it is at on the PSI gauge. I suspect you had it at precisely the right temperature that it found a balance. Also the less it rocks the less moisture is being vented from the PC, which is not a bad thing. In fact many people, myself included when I used to run prestos, glue quarters to it to get the damn thing to shut up lol. My lady hated grain prep days before I got my 75x's because I'd have multiple presto's tsk tsk tsk-ing away all day for multiple cycles and she would feel like she was going insane with the repetition of the same sound ALL DAY
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Nichrome
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Re: PC didn’t go so great, how do I determine usability [Re: Healing Oakland]
#27819757 - 06/14/22 06:04 PM (2 years, 7 months ago) |
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Slightly warped = time for a new pc.
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BlueAndOrange
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Re: PC didn’t go so great, how do I determine usability [Re: Nichrome]
#27819804 - 06/14/22 06:38 PM (2 years, 7 months ago) |
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I ordered a new PC, but the googles told me if the warpage is minor enough the presto can still be used. I’ve run 2 batches today in it. It’s still mostly flat.
Fortunately I have a stove in my basement so if it blows up I should be fine. I just have this one batch to do then it’ll be retired.
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Goatrider
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Re: PC didn’t go so great, how do I determine usability [Re: milkboy]
#27820190 - 06/15/22 12:41 AM (2 years, 6 months ago) |
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Quote:
milkboy said: Why do you recommend raising the trivet? I dont typically lose much water running 2.5 hours at 17 psi with the proper setting, is there another reason?
Maybe my post was confusing. I just wanted to know if he raised the trivet. If not, it´s for sure not enough water just covering the trivet. In total, it doesn´t matter how many jars you put in, raise the trivet or not, it´s always 3 quarts of water for a Presto.
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BlueAndOrange
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Re: PC didn’t go so great, how do I determine usability [Re: Goatrider]
#27820774 - 06/15/22 01:09 PM (2 years, 6 months ago) |
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The $170 lesson on remembering how much water to put in the presto.
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