Glass-fiber Reinforced Plastic (GRP) septic tanks are specialized equipment made from a matrix of synthetic resin and reinforced with glass fiber materials, designed for treating domestic wastewater. GRP septic tanks are actively promoted by the state as a composite material product, boasting advantages such as light weight, high strength, good toughness, corrosion resistance, vibrant colors, and a glossy finish resembling a mirror.

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