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If one does eat strictly glatt kosher and cooks non-glatt kosher meat in a pot. Later on, a different dish with glatt kosher meat is made. Would someone that adheres to glatt kosher standards require the pot to be kashered in between to continue to uphold glatt kosher standards.
Essentially if non-glatt kosher meat is cooked in a pot, and then glatt kosher meat is cooked in it without kashering in between, would the glatt kosher meat dish be considered non-glatt kosher?
According to Rav Moshe Feinstein (Igros Moshe YD 4:6) it seems that using such utensils would be permissible without any kashering . He bases his opnion off the Rama in YD 64:9 which discusses a case where a community allowed a certain type of fat which others considered assur yet the keilim were considered fine for all.
Rav Eliyashiv also holds that all the keilim are permitted to use. Text of Igros Moshe:
Text of Rav Eliyashiv psak:
See my answer here regarding chalev yisrael utensils:
You really are asking if blyiot (absorbed particles that get reabsorbed in food subsequently cooked in the same pots) of non-glatt kosher meat are an issue for those eating glatt. The answer according to the below authorities is no.
R Yitzchok Yaakov Fuchs (in his book Hakashrut, p. 317) writes
One who is invited to eat in a place where they are not meticulous about eating only glatt kosher meat may eat there foods that do not contain meat although they were cooked in pots that are intended for cooking meat in them.
In other words, they are not concerned that non-glatt meat absorbed in a pot will turn glatt meat cooked later on in the same pots into non-glatt. As such you do not need to kasher the pot.
R Fuchs quotes R Yosef Shalom Eliashiv (brought in Responsa Yashiv Moshe [Turetsky] p. 101) and Chazon Ovadia 1:30.
