The machines we sell use a very pure glycol and water based fog fluid that is pumped by the machine into a temperature controlled heat exchanger that then vaporizes the fluid into thick clouds of fog. The machines usually need about 5 minutes to warm up, then can then make fog for about 2 to 3 minutes continuously, then need a minute or two to reheat. The more expensive professional machines can make fog without the reheat cycle in between. The smaller machines will use about one quart of fog fluid every two hours if run continuously. That's a lot of fog.
Larger machines can use four times as much fluid if run in the same manner.
You'll void the machine's warranty and most likely clog the heat exchanger. We can sell any fog fluid we want, we stick with a high quality fluid that only contains very pure chemicals that won't clog heat exchangers and also put out high volumes of thick fog. Cheaper fluids contain less pure chemicals and more water, they also have a shorter hang time meaning they disappear faster. It's a false economy. We prefer not to sell them, the scent is one more impurity to run through your heat exchanger.