Here is some reading material for you:
Rule 1: First, do no harm. Learning to grow, extract, and formulate your own cannabis medications includes learning how to do so safely, as to […]
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During the time frame that I introduced the Mk III, I introduced the Lil Terp Passive extractor, which was based on the Mk III design, but […]
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In answer to your questions:
*what coffee filter should i use?
Any good quality standard coffee filter will work. I doubled them up and then backed them up with cloth at the discharge end of the column, to prevent blowouts. Retain it with a clamp, trim off excess.
*is dry ice worth to use?
Extracting below -50C reduces the pickup of non target elements like plant waxes, carotene.
Using dry ice to chill the recovery tank will allow you to use mixed gases in a passive system. Isobutane boils at -11.7C/10.94F, and propane boils at -42C/43.6F.
*should i invest in vacuum pump and chember?
Yes. You need the vacuum pump to run a closed loop system anyway and you need controlled heat and vacuum to purge the concentrate after extraction.
*when buying butane on what i need to look?, is simple lighter gas will do the trick?
It will work but may contain heavier molecules that may be left behind in your concentrate. With a closed loop system you can pre-distill the lighter LPG to remove those "Mystery Oils", but with open blasting you are stuck with them.
I use 99.95% Instrument Grade and still pre-distill it to get it down to 99.998%.
Here is a rating of lighter fuel brands best to worst with regard to Mystery Oil content, as compiled by Skyhighler and offered at https://www.icmag.com/ic/showpost.php?p=6099306&postcount=28 Best […]
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Here is how I distill it using an active system, but the same holds true with a passive system. It is about temperature control. Don't heat the collection pot hotter than about 29C/85F as the C-5 pentane component of Mystery Oil boils at about 36C/97F.
Closed loop systems like the Terpenator also have the ability to vacuum distill the LPG used in the process, so as to reduce the PPM […]
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*how its called in english this sort of heating pad with thermostat ?
Silicone rubber heat mat with PID control is how I would describe it.
Have fun, be safe!