Kli Rishon and Kli Sheini (Bitul and Blios #51 - Shulchan Aruch YD 105:2)

Kli Rishon and Kli Sheini: Basic halacha; Exceptions; Defanos Mekariros; Irui kli rishon; Tunnel Pasteurizer. See seforim by Rabbi Cohen at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠www.kashrushalacha.com⁠⁠