In septic tanks, domestic wastewater is partially clarified and then discharged into soakaways or drains. The sludge deposited at the bottom of the tank ferments for an extended period of 6 months, undergoing chemical transformation to mineralization through the action of living organisms, and is removed after this interval by pumping. Septic tanks strongly release marsh gases, ammonia (NH4), carbon dioxide (CO2), hydrogen sulfide (H2S), and very little methane (CH4), which is why efficient ventilation is necessary. USAGE WARNINGS: -FOR DOMESTIC WASTEWATER ONLY. -DO NOT introduce rainwater or pool water into the tanks. -Before installation and operation, ensure that clarified water can be drained. -The installation location must allow access for the pumping truck. -Ensure the tank is sufficiently ventilated, and the distance between 2 ventilation outlets is a maximum of 15 m. -DO NOT install in areas with high groundwater levels or flood-prone areas. -The resulting water CANNOT be used for irrigation. The tank is configured as a two-chamber polyethylene reservoir, with installed polypropylene connections and ventilation. The discharge connection is protected by a baffle, ensuring that the discharged water is clear, free of grease and solid particles. OPTIONAL (for adjusting cover position to grade): -Extension H=600 mm1) code 48710000604 -Manhole extension fixing piece code 47901000125 -Manhole sealing gasket DN640 code 47901000116 1)Do not install 2 extensions one on top of the other! For other inlet/outlet levels, please consult the manufacturer! The tank complies with standard SR EN 12566-1:2000/A1:2003. Technical data: -Volume: 4700 liters -Tank access zones: 2 x 630 mm -Dimensions: 2760 x 1760 x 1930 mm -Inlet/outlet connection: PP Dext 110 mm -Inlet/outlet level: 170/300 mm -Ventilation: PP Dext 110 mm -Weight: 190 kg. Packaging, handling, transport, storage, installation, and maintenance instructions are available on the website www.valrom.ro