Looking for an immersion brewer with zero water-plastic contact points and is also paper filtered. - Page 3

Coffee preparation techniques besides espresso like pourover.

#21: Post by jpender »

jedovaty wrote:Regarding the clay/paint materials, it's a valid concern. Some super fancy snooty snobby potters in europe have "shops" on etsy and will specifically advertise they are using food safe glazes. I think the purion 360 brewer is glazed inside, so it won't absorb any of the coffee, and I don't know if glazes have any water-soluble compounds that leech?
The Aurli Purion 360 brewers are not all glazed. They come both glazed and unglazed. I can't tell from their website if the glazed version has some unglazed surfaces like what I've seen in my pottery class.

It's part of their marketing that the clay used is mined from some special place in Taiwan and has mineral content that affects the brewing quality of certain teas. There is a hint of pseudo-science in that but the clay is fired to cone 10 which likely results in a very hard, pretty much food safe surface. The only issue with unglazed clay is that due to surface texture it may be difficult to clean well enough to ensure there is no bacterial growth. That's not likely a serious concern with coffee. Similarly, anything that leaches out of unglazed clay is probably harmless and at very small concentrations.

But for someone who is highly sensitive it might be perceived as an issue.

BTW, I read a little bit about the teapots Aurli make on a tea forum. Those tea people are as crazy as we are. Maybe crazier!


#22: Post by jedovaty »

I just sent you PM to the australian cafe that carries it. They offer one with a glazed on the interior. I have never ordered from them. Looking over their shipping policies, I don't see whether they ship to the US. Their website has changed since last time I looked into this (about three months ago), or it is a different shop all together.. sorry I wish I had more details! Good luck :)


#23: Post by rmongiovi »

If it's porous even if nothing harmful leaches out I'd expect it to absorb coffee oils which would then turn rancid. Buildup is supposed to be beneficial for tea but I've never heard the same said for coffee. I don't see how this could avoid having an impact on the flavor.


#24: Post by jedovaty »

rmongiovi: this one's for you :mrgreen:


#25: Post by rmongiovi »

Yeah, I wrote those off long ago. Hence my comment on the Purion. I prefer it to be at least possible to clean things that come in contact with my food.

Avoiding plastic seems like a losing proposition to me these days. It's ubiquitous. Cleanliness is still a goal though.

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#26: Post by pGolay »

It makes all the difference whether the clay is vitirfied in the firing and to what extent - it could be anywhere from completly porus so as not to even hold water to virtually glass with almost no absorbtion. The thing Hoffman is reviewing seems like it is some sort of in-between thing where there is a matrix of relatively large particles in some ceramic material- it would be interesting to know more about it but it strikes me residing on the less clean end of the spectrum, whereas the two part Purion thing looks, to me, more like high fired non-porus stuff and virtually as cleanable as glass, especially if glazed inside. I kinda want one, to see.


#27: Post by jpender »

Yes, exactly. I'll bet these guys are making a solid product. The question is whether it passes the sniff test for someone highly sensitive to the perception of any sort of possible leaching or contamination.

I'm wondering if I can make one. It likely means sanding/grinding fired clay which isn't much fun. And for the glazed version I'm not sure how they account for the glaze not throwing off the fit.


#28: Post by Eiern »

jpender wrote:That's a pretty cool technique, assuming it works reliably.

But the water would still be in contact with whatever material the press seal is made from.
You can find models witout a seal on the plunger, just the metal mesh bent upward a little sometimes with a spiral spring going along the edge. I had one which was all metal parts.

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#29: Post by Almico »

I brew tea at my coffee bars using Ball jars with SS sprouting screens to replace the solid lids. I brew a lot of tea and it's quick and easy. You can do the same thing with coffee: just place a paper filter over the mouth of the jar before screwing on the top and pour into your cup.

Pro tip: warm up the jar a bit before adding hot water.



#30: Post by jedovaty »

The stone pourover by hoffman was a joke post, it's not even immersive or using a paper filter as per the original parameters requested here.

Almico, that's a great idea, I wonder how drawdown would compare to pouring off a french press through a paper filter.

jpender: I spent an hour last night going through my history and trying a variety of search terms, I can't find the colorado based pottery shop that was making local duplicates of the mk studio drippers. Sorry. But, it reads like you do a little pottery work, if you try the project keep us updated :)