KDF process media is used in pre-treatment and primarytreatment applications to supplement or replace existintechnologies in order to extend system life and to reduce heavy metal contamination, chlorine and hydrogen sulphide. It is often combined with other technologies to achieve superior overall results. KDF filters are used most often in conjunction with an activated carbon filter. They prolong the life and increase the effectiveness of carbon filters by reducing chlorine build-up. They also supplement the activated carbon filters by removing heavy metals, something that carbon-based filters are not very effective at removing.