@Transform - For me, the Mimosa/Acacia brews after freezing is pretty clean, the freezing definitely seems to precipitate out most if not all of the tannins and plant gunk. The plant gunk can be easily filtered out, but those darn tannins are so minuscule that merge back into the water when filtering and slip right through the filters. If only tannins were big enough particles to actually filter out easily, that would be great lol.
But yeah i do a few full freezes, let em' completely thaw, all the plant gunk and tannins precipitate out and fall to the bottom, perhaps if left in the fridge for a bit all that gunk would settle and like clump together and one can just pour the tea off easily without disturbing the sediment, but i'm a bit impatient lol so i just freeze/thaw/filter em' a few times, each freezing seems to precipitate out more gunk, at some point i've noticed especially with Mimosa that a reddish oil will precipitate out and like stick to the bottom of the container, idk what the oil is, it's probably just some sort of plant oil/fats or something, but yeah freezing/thawing/filtering a couple or so more times past that point, leaves a very clean tea, but with some tannins at the bottom, hence why i use a syringe to suck up the clean up as much as possible away from the little bit of tea at the bottom with the residual tannins. The clean tea, once reduced/concentrated to final volume, is very drinkable/palatable, no tannins, no astringency, tastes pretty much like water, which i imagine perhaps one could add some flavoring to it or mix it with an herbal tea, i personally mix it with Lemon Balm tea and drink it while warm with some sweetness added, just tastes like an herbal tea, tastes clean, by far the way to go as far as water-based teas go imo.
Haven't found much else to get around the tannin issue, though i have read about using a higher pH to possibly precipitate out the tannins, perhaps then they might be a bit more filterable idk, the issue with that though is then re-acidifying it (and would there be any residual base in the tea after neutralization by the acid? i mean does it just go away or change into some inert chemical or does it linger in some form? plus, what about the acid itself, could it perhaps be neutralized after dissolving the DMT, and then just like with the base, what happens to the acid?), and personally i don't care for acidity if i can help it, ime it makes teas taste horrible and the smell worse, especially vinegar which smells like boiling vomit lol, i've also tried citric acid but the taste was just as horrendous and the smell also was a bit more increased while boiling, so i just don't use any acidity and just use straight water and shredded root, in a big pot, multiple boils, combine and reduce a bit, freeze/thaw/filter a good few times, and then use the syringe for the clean tea portion and reduce that down to final volume and it's good to go.
If it weren't for the taste and perhaps smell, i wouldn't mind trying out acidic brews a bit more to see if there's a difference, it would be interesting if there are differences depending on the salt form, but alas i just stick to regular ol' tea, and sometimes (and when i started out) some root powder capsules when i wanna go that route, but tea is best ime, and much preferred, but capsules are nice too, especially of like evaporated tea residues or some sort of alcoholic extract i imagine, which the method you describe sounds pretty much like what i described a moment ago, and i think that route could be interesting and doable imo, both using alcohol as well as just straight water perhaps, but the alcohol seems like a good way to go i think, which i assume pretty much any kind of alcohol should work though, right? I've wanted to make a nice concentrated tincture for awhile now, i just want something that'll taste fine and be palatable, like whether some drops in the mouth or dissolving it into like a tea. I'm also rather curious about an Aya nose spray lol, which i think it's probably doable and without a burn, just gotta make it so it doesn't irritate the nose, and then make sure it's concentrated enough and pure/clean enough to spray, i bet it'd be awesome lol.
But yeah as far as Aya nausea/vomiting goes, ime Harmalas/Rue (not so much Caapi because Harmine isn't really that much of a purgative, which i think is what brings in some confusion) has caused me hella nausea/vomiting, without DMT lol, just Harmalas/Rue on it's own, as the dosage increases, it's quite nauseating, though i don't think most people venture that deeply especially with Rue, not so much with the Rue dosage, 3 to 4 grams of Rue is plenty, 4 grams is STRONG lol and is plenty, don't need more than 4 grams.
But if taken nightly for a bit, the Harmala content gets stronger and stronger and stronger and it can become "a bit" too much lol, to say the least. Dizziness, motion sickness, tracers/trailing, a like light stuttering effect when moving around and moving the eyes, severe nausea/vomiting, i'm talkin' like purging the demons from the pits of your soul type vomiting, no DMT involved lol. I think the Harmala-related nausea/vomiting has more to do with the Acetylcholinesterase inhibition, but at the same time like different Acetylcholinesterase inhibitors ime affect me differently so some will feel lighter, some will feel heavier, some will feel more cerebral, some will feel much more physical, but ime there's some definite Cholinergic action going on with Harmalas, and with DMT (as well as Serotonin in general), and even Cannabis, and of course Tobacco, and all of that together you definitely notice the Cholinergic potentiation of things ime.
But if not the Acetylcholinesterase inhibition, Harmaline iirc does do something with Dopamine 2, and Dopamine 2 agonsim may cause nausea/vomiting, there's also some Opioid receptor activity that i think Harmaline is capable of as well and that of course can cause nausea/vomiting as well (and constipation, which ime i've gotten a lot of when dosing Rue over the years, though that could also perhaps be more reflective of my diet, or that i use ground up Rue seed encapsulated and that may potentially be a source of fiber idk, plus i have like microbiome issues, but i do notice more constipation when i dose Rue regularly vs when i don't).
But ime with Harmalas/Rue/Caapi/Harmine, i notice that when you take them on their own without DMT, the effect is rather cleaner, lighter, you don't notice certain aspects, and certain side-effects aren't there, unless you take higher dosages. But, when the DMT is then added, the effects of the Harmalas come out more than they do without the DMT in the mix, so the DMT (as well as other Psychedelics, like mushrooms, and 4-ACO-DMT) like illuminates and brings out the effects of the Harmalas, and that ime includes the Harmala purge.
Again though, DMT is very very Adrenergic, it's ime one of DMT's absolute main properties that i can feel/notice even from taking just one to 2 grams of Mimosa root powder encapsulated, it's the very first thing i feel/notice even when the DMT dosage isn't at the level where the Psychedelic effects start coming out, so like 1 to 2 grams of Mimosa powder to me feels a bit like a stimulant kinda, and i notice the same effect/feeling/property when smoking DMT too, it's what i associate with the intensity during the come up, if it weren't for the Adrenergic properties of DMT and if it felt more like Psilocin does when combined with Harmalas (a distinct lack of Adrenergic effects, very clean feeling, no nausea at all at least with 4-ACO-DMT, still can no doubt purge though) then the come up wouldn't be nearly as intense and would be less of an issue imo, hence why i prefer/recommend to sip on the DMT-containing tea for 10 to 15 minutes for a smoother/less intense come up, or to similarly sip on Changa by letting the initial come up feeling pass which only lasts a couple or so minutes and then once it stabilizes from there one can smoke on the Changa with ease and comfort and it's so much more inviting then and not jarring at all. So it just depends on how you prefer to work with/consume it, if you want it intense af (which has it's benefits) or if you want a smoother ride (which also has it's benefits).
But as far as it's Adrenergic properties and the nausea/vomiting goes though, i'm pretty sure that's where DMT's purgative effect comes from, it's also absent from Psilohuasca in that Psilocin lacks Adrenergic properties and at least i definitely notice the similarities and the differences due to receptor binding and such between Ayahuasca and Psilohuasca, for me Psilohuasca feels like and is Ayahuasca, just using Psilocin instead of DMT, and Psilocin isn't as complex in it's receptor binding profile from what i've seen and is rather more simple i think and that's definitely reflected back during the effects/experience. But DMT's Adrenergic properties i do believe is what causes the DMT purge, but like i said with regular consumption you do get used to that as well, and perhaps sipping on the DMT can also help with that by not having your system flood with Adrenaline but have more of a "slow drip" of Adrenergic effects.
Another thing is that Harmine is rather clean/clear in it's effects, compared to Harmaline. I've noticed that when i take Harmine itself, or when i take Caapi, it's not at all like Harmaline, Harmaline has a lot more going on than Harmine, but yet it is also capable of inducing the Harmala purge when dosed high enough or when allowing it to get stronger through the reverse tolerance. So when people take Caapi or Harmine, they're not going to really notice much in the way of purgative effects unless they dose high enough, but if you take a reasonable dose where there's not really any side-effects noticeable, and you add in the DMT, the DMT will bring out the effects of the Harmalas and can trigger the Harmala purge, but DMT's Adrenergic properties may contribute to that. With Rue/Harmaline though, it's a lot rougher at first until you get the body used to it, and so it's much more noticeable than Caapi or pure Harmine, and since Harmaline is the dominant and stronger Harmala in Rue, it's very easy to get into heavier territory with Rue/Harmaline than with Caapi/Harmine, and i think that helped me notice a lot more about what was going on with the Harmala side of things because Harmaline is much more active than Harmine, Harmine seems a bit more like Moclobemide in comparison, rather clean mentally and physically but with a definite Harmala feel/effect to it, Harmaline though is more active and thus more noticeable and so i've noticed things from it that also applies to Harmine but Harmaline brings things out more than Harmine does.
And so this effect of DMT bringing out the Harmala-related effects/side-effects that aren't particularly noticeable without the DMT in the mix, ime causes the DMT to trigger the Harmala purge, mainly, but secondarily, DMT's Adrenergic properties can also contribute i do believe, but once you get used to the Harmalas and the DMT, and let the side-effects go away, you can take it nightly and after awhile have purge-free experiences no matter the dosage, and much more functional and user-friendly and able to be better worked with then instead of just laying there and taking it lol, you can actually like get up and do things, but it's still best to spend the come up in a good space and focus inward and go through the process and then when things stabilize you can get up and move around, but no real side-effects at that point and the nausea/vomiting is a thing of the past, so long as you keep up with the tolerance/reverse tolerance.