Totally chlorine free (TCF) means that there are no chlorine molecules used in a product. Chlorine is a chemical element that is used in a lot of everyday products, like clothes and paper. But it can be harmful to the environment if it’s not managed properly, so some companies have decided to make products that don't use chlorine. So if a product is TCF, it has been made without the use of chlorine, which is better for the environment!