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Offlinedebianlinux
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Gypsum vs. Lime
    #1128560 - 12/10/02 01:11 PM (14 years, 3 days ago)

Was about to make an order from a homebrew site and saw that they had gypsum. Don't have TMC handy here at work but do remember gypsum being mentioned. Maybe added in grain jars or into the casing (for peat?)? Definitely for pH control. Anyway, seems like lime would be a reasonable substitute and Lowe's sells "pulverized lime" in a 50lb bag for $1.27. That makes the lime about 50X cheaper! So, will this pulverized lime do the same trick? I'm mostly concerned with subtle differences such as "use X grams of lime in place of Y grams of gypsum" and also whether or not gypsum will still have an immediate effect on pH without that leeching that lime has where the pH will continue to drop over time.


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Invisiblezeta
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Re: Gypsum vs. Lime [Re: debianlinux]
    #1128597 - 12/10/02 01:18 PM (14 years, 3 days ago)

Gypsum = calcium sulfate
Lime = calcium hydroxide
As far as I know, gypsum has no effect on pH. I's only use in cultivation is to add a bit to grains to stop them sticking, but never to alter the pH of casing material.



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Invisiblegeorge castanzaM
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Re: Gypsum vs. Lime [Re: zeta]
    #1128665 - 12/10/02 01:33 PM (14 years, 3 days ago)

calcium carbonate 5/8 tsp per gallon before fermentation to lower acity approx. 15%.i just bought some yesterday this is what on the bottle it says.$1.20 i spent on 2 oz . by my rough estamation it should do 550 quart jars of rye. that should last kramer quiet a long time.if the recipe calls for x use x, if you can.






















































































































































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pftek said:Impossible to clean everything right now. Maybe in a week.





ROTHBURY

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OfflineFred Garvin
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Re: Gypsum vs. Lime [Re: george castanza]
    #1128783 - 12/10/02 02:03 PM (14 years, 3 days ago)

Funny post Georgie boy.  :mad:
But if I'm not mistaken, which is surely possible, hydrated lime is added to casing mixtures to slightly increase acidity to prevent contaminations. Gypsum is used in grain and millet to decrease stickiness and promote shakeability.



   


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The above statements are just the incoherent babblings of your friendly neighborhood Cracker!

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Edited by Fred Garvin (12/10/02 02:08 PM)


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InvisibleBilge
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Re: Gypsum vs. Lime [Re: Fred Garvin]
    #1128961 - 12/10/02 02:56 PM (14 years, 3 days ago)

hydrated lime is added to *decrease* acidity = increase alkalinity = increase pH, right?


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OfflineOn_the_Down-Low
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Re: Gypsum vs. Lime [Re: Fred Garvin]
    #1128982 - 12/10/02 03:03 PM (14 years, 3 days ago)

The Ph scale goes from 1 to 14. 7 is 'neutral'. 1 is superacidic- think batteryacid.

If you have a '1'(acid) and you add some thing alkaline(limestone- say it's an '8')- you end up with sort of an average of the two. 1 + 8 =9. 9/2=4.5 , so you would end up witha Ph of 4.5. ( this is horribllyoversimplified,but itshould give you the idea). Picture ii like a timeline-starts at 0 and goes to 14.


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Invisiblegeorge castanzaM
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Re: Gypsum vs. Lime [Re: Fred Garvin]
    #1129004 - 12/10/02 03:19 PM (14 years, 3 days ago)

don't make me he-man bitch smack you.  :blush: calcium carbonate is used to lower acidity in home brewing what do you think they sell it for? to stop the grain from clumping?shakeability?yes shakeability thats what i got mine for :grin: 


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Quote:

pftek said:Impossible to clean everything right now. Maybe in a week.





ROTHBURY

:pm:


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OfflineFred Garvin
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Re: Gypsum vs. Lime [Re: On_the_Down-Low]
    #1129009 - 12/10/02 03:19 PM (14 years, 3 days ago)

Thanks guys, I was thinking one way and typing another. It's been an ass-backwards day today!!

At least I was 50% correct. Great odds eh? :cool:

 


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The above statements are just the incoherent babblings of your friendly neighborhood Cracker!

Shur drinkin kils brane sells--but only the week ones!!


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OfflineFred Garvin
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Re: Gypsum vs. Lime [Re: george castanza]
    #1129019 - 12/10/02 03:24 PM (14 years, 3 days ago)

wtf?


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The above statements are just the incoherent babblings of your friendly neighborhood Cracker!

Shur drinkin kils brane sells--but only the week ones!!


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Offlinedebianlinux
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Re: Gypsum vs. Lime [Re: Fred Garvin]
    #1129132 - 12/10/02 03:54 PM (14 years, 3 days ago)

all the ass-backwardsness has confused me a bit. here is my understanding, clarify if wrong: gypsum = neutral = anticoagulant or whatever for grain. lime = pH control = buffers towards akalinity. Don't use lime, (why not?) use calcium carbonate.


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Re: Gypsum vs. Lime [Re: debianlinux]
    #1129140 - 12/10/02 03:57 PM (14 years, 3 days ago)

an apology on my incorrect statement about pH dropping in my original post. my brain is wired wrong and I consider moving from acid to base a downward movement (see bases are usually at the BOTTOM of things). It actaully would raise the pH. thanks for the correction.


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OfflineTorey
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Re: Gypsum vs. Lime [Re: debianlinux]
    #1129359 - 12/10/02 05:05 PM (14 years, 3 days ago)

pH Control ingredients: Oyster shells & Gypsum (pH buffers). Limestone (pH riser)
? (Oyster shells: Ground oyster shells are used as an additive in a casing. They give the casing a better structure and buffer the pH.)
? (Gypsum: Calcium sulfate, CaSO4. A greyish powder used in spawn making. It prevents the clumping of the grain kernels and acts as a pH-buffer.)
? (Limestone: Calcium Carbonate - CaCO3. A white powder. Used to rise the pH of a casing.)

Gypsum is known as "plaster of paris" in craft stores.
Osyter shells are reportedly available at garden centers, not to my luck.
I haven't yet been able to find a source of lime. Would horticultural lime work? We use it to opaque the roof's of our greenhouse.


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Amazon Shop for: ½ Pint Jars, Calcium Carbonate, Gypsum, Oyster Shell, Paul Stamets, Peat, Portable Greenhouse, Rye Grain, Scales, pH Test Strips

Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

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