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InvisibleFooMan
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: eLeSDenes]
    #18931437 - 10/04/13 02:22 PM (10 years, 3 months ago)

Quote:

eLeSDenes said:
Wouldn't it be easier to just try it?:p




:congrats:


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OfflineRauhfasertapete
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: eLeSDenes]
    #18931479 - 10/04/13 02:31 PM (10 years, 3 months ago)

I made lots of experiments with substrates when I started, but on a small scale and under the not quite ideal conditions of a crappy hobbygrower´s growing chamber, I never got any valid results. Just too many parameters that could be involved, and too many cases of randomly occurring contaminations, or the occasional jar that slips from of my fingers and falls to the ground...  actually i don´t have the patience to try to really find out the "fine differences" between substrate ingredients.


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InvisibleSkinty
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: Rauhfasertapete]
    #18932303 - 10/04/13 05:38 PM (10 years, 3 months ago)

Yr gonna be (re)sterlilising any verm you use for pf cakes so it really doesn't make any difference if you reuse - as long as it's dry :thumbup:

Also - if you cook it in the oven be careful cos I've heard it can ignite - might be bullshit but that's what I've read :shrug:


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InvisibleSpitballJedi
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: Skinty]
    #18932457 - 10/04/13 06:08 PM (10 years, 3 months ago)

Your dry verm layer may not have any visible contams on it, but I'm sure the same could be said when you first bought the bag.

Using it to mix with BRF and sterilizing seems reasonable.

The reason i would not use it as a dry contam barrier again is because it may have a bit of BRF in it.

You can buy verm online pretty cheap if travel is an issue.


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Offlinekrypto2000
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: SpitballJedi]
    #18932470 - 10/04/13 06:11 PM (10 years, 3 months ago)

Dry BRF shouldn't contaminate either though, if it did we couldn't store it unless under sterile conditions which isn't really feasible for someone who doesn't have a lab in their house.


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InvisibleSpitballJedi
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: krypto2000]
    #18932582 - 10/04/13 06:32 PM (10 years, 3 months ago)

That's true. But, BRF is highly nutritious and there is some moisture in the PF jars.

The line between where the dry verm/brf ends and your substrate begins would be a little to blurry for me.

The way PF Tek is supposed to be done, there's a pretty thick layer of clean, sterile, dry vermiculite that a contam has to travel through. A little BRF in the wrong place seems a little too risky for saving a nickle.


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Edited by SpitballJedi (10/04/13 06:33 PM)


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Offlinekrypto2000
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Re: Can I sterilze and reuse the top layer of vermiculite from pf tek jars? [Re: SpitballJedi]
    #18932661 - 10/04/13 06:50 PM (10 years, 3 months ago)

I agree, it's definitely opening up another possible vector for contamination. If the OP *really* was determined to reuse it you could bake it until the BRF has carbonized and then it might even help prevent contamination at that point by providing an even better filter than pure vermiculite alone. That's clearly going off of standard practice however so do so at your own risk. If you truly want to be safe and secure just use fresh verm and stick to a standard tek.


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