Our sewage treatment plants from Marsh are available in a wide range of configurations in order to suit underground drainage applications of all sizes. Marsh are one of the biggest producers of wastewater treatment and management systems all throughout the UK.Their ENSIGN ULTRA line of treatment plants have all of the features and benefits of the standard ENSIGN range, but also boast unique components such as an advanced compressor that is more cost-effective and an RCD box for electrical connection. They conform to the BSEN12566-3/A1:2009 requirements and operate at a 97% pollutant removal rate.This sewage treatment plant has a capacity of up to 4 people and features a 250mm riser. To reduce the risk of blockages and spillages, this plant is also fitted with a Marsh MA1 Beacon Alarm without a Pressure Switch which is triggered when the pressure inside the plant drops beneath the adequate level.Benefits of this productCompliant with BS EN12566-3 specification25-year structural guarantee2-year compressor guarantee97% pollutant removal rateFeatures stabilising feet for safe transportation and installationImpermeable lid for extra securityHuge selection of configuration options