2.5m Capacity Long Lifetime Underground Septic Tank PE Septic Tank for Household Sewage Treatment

Our HDPE biogas septic tank is an eco-friendly on-site wastewater treatment solution designed specifically for household underground restrooms. Made of premium high-density polyethylene via seamless rotational molding, this underground unit integrates sewage sedimentation, anaerobic purification and biogas recovery, offering an ideal decentralized sewage disposal solution for individual households without municipal sewer access.

• Superior Leakproof Performance: One-piece rotomolded construction eliminates seams and joints, effectively preventing sewage leakage and odour escaping, protecting local soil and groundwater from contamination.
• Long Service Life & Great Durability: High-performance HDPE material delivers strong resistance to corrosion, acid, alkali and ageing. It can withstand decades of underground burial without cracking, rusting or deforming.
• Biogas Energy Recycling: The scientific multi-chamber design enables staged anaerobic fermentation. It decomposes organic pollutants in toilet sewage while capturing biogas that can be reused for cooking and lighting to cut household energy costs.
• Fast & Simple Installation: Far lighter than traditional concrete septic tanks. No concrete pouring or long curing period. The tank can be buried and put into use quickly, reducing labour and construction expenditure.
• High Structural Stability: Reinforced ribbed wall design enhances compression resistance, allowing the tank to reliably bear backfill soil pressure and adapt to yard burial conditions.

This septic tank is widely used for independent household underground restrooms. It is perfectly suitable for rural family homes, courtyard houses, private villas, mountain cabins, holiday cottages, farm stays and remote scattered dwellings. It is also popular for remote off-grid buildings, where centralized sewage pipelines cannot be laid. When matched with rainwater harvesting tanks and drainage accessories, it can form a complete on-site water management system for yards.

We are Guangdong Wanquan Construction Technology Co., Ltd., a professional manufacturer focusing on sponge city and sewage treatment products. All products go through strict water tightness and pressure testing before delivery. We provide flexible capacity options, installation manuals and professional technical guidance. Customized solutions are available upon request.

It is a sustainable, low-maintenance and budget-friendly option for global household decentralized sewage projects. Contact us today to get a tailored solution for your project!

Guangdong Wanquan Architectural Technology Co., Ltd. is headquartered in Guangzhou and was founded in 2011. It is a new environmental protection science and technology enterprise specializing in the integration of comprehensive rainwater utilization and prefabricated pumping station development, sales, and engineering construction. The company has a professional sales team, design engineers, and a large injection molding workshop. Over the years, the quality of our products and services has earned the unanimous recognition and affirmation of our customers.

Main products include rainwater collection and reuse systems, finished linear drainage ditches, siphon rainwater systems, integrated prefabricated pump stations, plastic inspection wells, stainless steel water tanks, and more. These products have been widely used in residential areas, municipal roads, large stadiums, exhibition centers, industrial plants, landscaping projects and other construction projects. For well-known domestic comprehensive rainwater utilization companies, fire protection companies, and a number of water supply and drainage equipment engineering installers, mechanical and electrical equipment installers and builders, we provide engineering support.