In general, there are three types of filters: mechanical filters, activated carbon filters, and ozone generators. Mechanical filters are the simplest type of filter and work by trapping particles in the water. This type of filter is good for removing sediment and other large particles from the water. However, it does not remove any chemicals or toxins from the water. Activated carbon filters are more effective than mechanical filters at removing chemicals and toxins from the water. They work by adsorbing (binding) these substances to the surface of the carbon granules. Ozone generators are a type of activated carbon filter that produce ozone gas. This gas is then bubbled through the water, which helps to remove more chemicals and toxins.