This document discusses using natural fibers as filter media for domestic wastewater treatment. It studies the efficiency of Agave sisalana fibers and Areca husk fibers at removing contaminants like COD, BOD, sulfate, and nitrate from wastewater. The study finds that both fiber types significantly reduce these contaminants, with Agave fibers achieving slightly higher removal rates on average. A combination of the two fiber types performed best of all. The treated water could then be used for purposes like gardening and cleaning. In conclusion, natural fibers show potential as a low-cost filter option for wastewater treatment, especially in developing areas.