Evening all I brewed up my first cider last night in a fermenter with a air lock no I set the air lock to half and half with water last night and checked it this morning and it was fine I have come to check on it tonight and only one side had water in and it's bubble ing like mate I try topping it back up so it would go half and half again but only fills the first side and keeps bubbleing and the water spits out the top is this normal or am I doing something wrong help