Glass-fiber Reinforced Plastic (GRP) septic tanks are specialized equipment made from a synthetic resin matrix and glass fiber reinforcement materials, designed for the treatment of domestic wastewater. These tanks are actively promoted by the state as composite material products, offering advantages such as light weight, high strength, excellent toughness, corrosion resistance, vibrant colors, and a glossy finish that approaches mirror-like quality.

Far surpassing similar products made of ceramics, rigid plastics, and steel, they are widely used in industries such as chemicals, petroleum, construction, textiles, aviation, navigation, transportation, electricity, metallurgy, machinery, food, papermaking, and environmental protection.