The GRAF Carat 6500 Litre Septic Tank is the premium, eco-friendly solution for off-mains sewage disposal for small households of up to 30 people. Engineered in Germany and manufactured from 100% post-consumer recycled plastic, the Carat tank combines extreme structural stability with a lightweight design that simplifies installation.
Whether you are replacing an old system or installing a new one for a domestic extension, the GRAF Carat provides a durable, "fit-and-forget" solution that meets all UK environmental standards.
Capacity: 6500 Litres (Optimized for up to 30 inhabitants).
Eco-Friendly Construction: Manufactured from 100% recycled plastic, offering a sustainable alternative without compromising on strength.
Shallow Dig & Easy Install: The unique design allows for a shallower excavation, reducing installation costs and time. Being lightweight (265kg), it can often be installed without the need for heavy cranes.
Groundwater Stable: Highly stable design allows for installation in difficult ground conditions, including high water tables (up to halfway up the tank).
Granular Backfill: Unlike many traditional tanks, the GRAF Carat can often be installed using granular backfill rather than a full concrete surround, saving significant material costs.
Warranty: Backed by a 15-year manufacturer's warranty and a design life of 50 years for total peace of mind.
This system is the go-to choice for homeowners looking for a high-quality, long-lasting septic solution:
Extreme Stability: Each tank is manufactured using high-precision injection molding, ensuring consistent wall thickness and the highest level of structural integrity.
Modular Flexibility: The tank features a rotating tank dome to help align the connecting pipes with ease during site setup. Also available with 400mm (250mm Working Height) Neck Extension Piece for deeper installs
Low Maintenance: The internal two-chamber design effectively traps solids and floating material, allowing wastewater to flow freely into the drainage field with minimal risk of blockages.
Graf Carat 6500 Litre Septic Tank Drawing
| Specification | Detail |
| Model Code | G50082 |
| Capacity | 6500 Litres |
| Max Population | 30 Persons |
| Length | 2390mm |
| Width | 2190mm |
| Total Height | 2530-2730mm |
| Weight | 260 kg |
| Material | 100% Recycled Duralene (Polyethylene) |
| Warranty | 15 Years |
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