Domestic wastewater has high consentration of contaminants especially BOD5, COD, nitrogen, phosphorus. If this wastewater which was not treated dischage directly into ponds and lakes, it will affect seriously to the life and ecosystem. Fibrous sustates area biological technology in which micro-organisms exist in adhesive form can treat BOD5, nitrogen, phosphorus in waste water. Fibrous sustates are not only affected by flow velocity but also has homogeneous thickness, adhesive ability, lower cost, larger surface area high durability. Additionally, minimize congestion, make easy and can apply to treat seawage for the developing economic region with high efficiently.