Well I just found out I've been put in charge of trying to pull off an effect the concert promoter wants for our halloween show. Basically, he wants to fill the orchestra pit with fog and put some red lights down there. I do have a fog chiller...one of those cheaper ones that uses ice to do the trick, and it didn't work. The pit is about 3 feet deep, and maybe 28 feet wide at it's widest point. My fogger didn't have a high enough output to get the job done right, plus the fog kept warming up too fast and wouldn't stay in the pit. I've never used dry ice before, so I don't know if using it will be the solution. Does dry ice fog linger longer than regular ice chilled fog? And how much dry ice do you think I'd need to keep this going all night? We can't afford to rent an actual dry ice machine, so the plan is to put it in a small tub of warm or hot water. And how much does dry ice usually cost and where can I get it? I'm doubting we can pull this off...the show is saturday...but I told him I'd look into it.