Daas –
“My posek allowed it using irui kli sheini (which has a din of kli shlishi), but doesn’t allow tea bags in a kli shlishi. I didn’t ask him about pour over coffee, but I assume it’s the same as tea.”
It sure is the same or even worse, as the reason your Posek doesn’t allow a Kli Shlishi that he is chosesh to the Aruch haShulchan that upholds that the process of tea even in a Kil Shlishi is considered “gmar’ bishul or Bishul Kal” that these fall into a different category that even a Kli Shilishi is considered bishul. Whereas, instant coffee is already “cooked” processed.
However, the Igros Moshe strongly disagrees with the Aruch HaShulchan; a) that nowhere do we find that a Kli Shlishi can be considered any way as bishul. b) Also, being that even if you leave tea in cold water it will process, so its not the “cooking”…
Now, i’m not sure about ground coffee, as coffee if left in a “cold brew” for many hours it will brew as well..
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