An awful lot of arms length knowledge on how atmospheric effects work in this thread. 1) Dry Ice machines can never produce atmospheric haze type effects for use with lasers. They are inherently expensive and hazardous to operate (you are putting pellets of solid CO2 into boiling water) and all your get is low hanging vapour that sits on the ground and then vanishes - totally impractical for something like Scooby. 2) Most all water based âhazersâ are neither of those two things. They use glycol and water mixture, so when they say âwater basedâ they mean not oil basically. They then use a traditional smoke machine style pressure pump and heating block to produce smoke and then combine it with a fan to make the âhazeâ. The cons are more cloud like haze that will set off any sort of detection system based on particles, and they tend to use a lot of fluid which is expensive (think $400+ for one 25L bottle). 3) People have a a misinformed idea that Oil Based Hazers = mess and CO2 powered hazers = expensive to operate. They are both inaccurate. The indisputable best haze system on the market is from a Canadian company and uses both Mineral Oil based fluid, and CO2. It uses their proprietary tech to break down the mineral oil under heat and pressure into tiny micro controls particles which result in an extremely fine, dry haze that leaves no residue, lasts for hours and uses very very little fluid. Rather than a pump it uses pressurized CO2 to push the fluid through the system, and tiny amounts of that to. Its both cheap to operate, works great, is reliable and in many cases wonât even set off particle detectors itâs so fine. So you then probably ask, âwhy doesnât everyone use it?â Most simply because of scare opinion that Oil = Bad so they donât even try. But in fact Village themselves use the same system at the Outback Spectacular show, uses so little consumables it uses maybe 2.5L of fluid a fortnight and runs off the waste CO2 gas from their low fog system. So itâs not about amazing detectors, or being too cheap or any of that. Itâs about perception by the powers that allow these things or not. And if the risk analysis wonât allow something then no amount of âpassionâ or âattitudeâ is going to change anything. Itâs perception at that level that requires altering and thatâs much harder than buying a fancy purple haze machine