The Marsh Ensign Ultra 4 Person Sewage Treatment Plant is a compact package treatment plant for buildings that are not homes. With a population equivalent of 4, it suits garden rooms, small offices and workshops that are not on mains drainage.
Is the Ensign Ultra 4 Person Sewage Treatment Plant right for you?
Please note that this size is not suitable for a house. For dwellings, the minimum population equivalent is 5, so a 6 person plant is the smallest you should choose for a home. For a small outbuilding, however, the 4 person plant is an ideal fit, and it complies with BS EN 12566-3.
Key features
- Complies with BS EN 12566-3
- Near-silent advanced compressor with low-pressure alarm
- Primary settlement, aeration and final settlement chambers
- Compact footprint for small sites
- External compressor housing supplied as standard
Options
Before adding the Ensign Ultra 4 Person Sewage Treatment Plant to your basket, choose a gravity or pumped outlet and a deeper inlet if your drain arrives lower than standard. The price updates as you pick each option.
Servicing and permits
Like all treatment plants, this unit needs desludging from time to time, and the compressor should be serviced regularly. For this reason, we recommend a service contract with a local engineer. In addition, please check with the Environment Agency, SEPA or Natural Resources Wales whether your discharge needs a permit or falls under the General Binding Rules.
Specification
- Population equivalent: 4
- Length: 1620mm
- Width: 1352mm
- Height: 1575mm
- Standard inlet depth: 540mm
- Empty weight: 100kg






