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OfflineKantarellen
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Registered: 07/06/17
Posts: 34
Loc: Gallifrey
Last seen: 3 years, 7 months
Gypsum, same as craft plaster gypsum?
    #26789061 - 06/28/20 07:24 AM (3 years, 7 months ago)

Hello! Been a long time since my last grow and i wanted to do a PF Tek grow again. Been struggleing to find gypsum where i live, exept in 25kg bags. Although my local hobby and crafts shop has craft plaster (fast drying gypsum for sculpting) and were wondering if it works the same? Cant find any info on if there are any wierd addatives or anything. What do you guys think?


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OfflineChikhaiBardo
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Registered: 12/14/19
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Last seen: 3 years, 6 days
Re: Gypsum, same as craft plaster gypsum? [Re: Kantarellen]
    #26789084 - 06/28/20 07:43 AM (3 years, 7 months ago)

I like to just use materials that are generally accepted as a safe product for living things; coir, brown rice, vermiculite. I have always had consistent, healthy, and successful growth by sticking with the basics. While the gypsum is the same (CaSO4·2H2O) I’m not sure I would want it near my babies. An item packaged and sold as a non food item is going to be handled as such and that just doesn’t sit right with me, but obviously everyone is different. If you’re looking for opinions then I would say pass on the gypsum altogether, and make some nice healthy cakes with BRF (grind your own or purchase) and verm.


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OfflineInnerWisdom
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Registered: 08/09/19
Posts: 1,936
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Re: Gypsum, same as craft plaster gypsum? [Re: ChikhaiBardo]
    #26789184 - 06/28/20 08:32 AM (3 years, 7 months ago)

You don't need gypsum for Pf tek. I don't know what you even need it for if doing coir bulks or anything. I don't think anyone uses it. Starting out I bought some too and used it in a bulk substrate, but it is useless.


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OfflineA.k.aM
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Registered: 10/27/19
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Re: Gypsum, same as craft plaster gypsum? [Re: InnerWisdom]
    #26789228 - 06/28/20 08:47 AM (3 years, 7 months ago)

Yeah you can use drywall.


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Offlinemetaphoric
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Registered: 05/18/15
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Re: Gypsum, same as craft plaster gypsum? [Re: A.k.a]
    #26789301 - 06/28/20 09:24 AM (3 years, 7 months ago)

You can use the plaster but you need to mix it with water first, let it harden, then break it up into a fine powder. You don't want it hardening in your sub, soaking up all the available water and hardening everything.


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