This is the most economical way to buy Delicer, especially for nursing homes, clinics, etc. And remember there is no shipping & handling charges on the gallon size. Anyone can get head lice. Head lice are found on all types of people and having them is not a reflection on cleanliness. They are easily spread by people sharing combs, putting heads together, wrestling, putting an infested piece of clothing on, or the "common hook" situation where hats, coats and clothes are hung on the same hook or locker. Head lice are present any time of year, with September being the worst month. Gallon container does not include a sprayer top.