I was curious about S-04 after reading posts about it and having not used it since kit-daze. On the 5/9 I brewed 21 lts of 1.040 using golden promise, TF brown and Simp's med crystal. Pitched 1 sachet of S-04 rehydrated into 20 deg. Went off. Come 7/9 the air-lock stopped ( It's my fermenter...