Sanitary

Dry and chemical toilets are equally expensive. Dry toilets are environmentally friendly, and often look better from the outside. They do not give off a chemical smell, as chemical toilets can. However, it is important to bear in mind that with dry toilets, the flush is replaced by a wood chip tray which may surprise some guests although this type of toilet is becoming more and more common. It is also necessary to provide someone to replace the trays regularly. 
Chemical toilets have a classic flush, but are less attractive from the outside. 
 

The toilet tank must be emptied after a certain number of passes, depending on the type of toilet, to avoid overflowing. So there is always a need to empty the tank at the end of an event, as well as if the event lasts several days, depending on the number of uses.