Cut to form these specially structured media take on the job of coordinated cleansing. They are evenly permeated by water & mechanically stop both coarse & fine particles. The carbon reacts by absorbing. It holds dissolved substances on its surface & removes them from the water cycle. Carbon Pads are structured filter media with activated carbon throughout to absorb & hold dissolved pollutants. They can only be used for short periods of time (up to 4 weeks) in order to prevent pollutants from releasing & re-entering the water cycle.