Marsh:Ensign Sewage Treatment Plant 4-16PE

Marsh Ensign:Standard Sewage Treatment Plant

The Marsh Ensign:Standard is a robust, low-maintenance sewage treatment plant for properties without mains drainage. With no internal moving parts, it's straightforward to install and commission, and needs minimal upkeep over time. Manufactured by Marsh Industries, one of the UK's leading names in off-mains wastewater treatment, it's tested and approved to BS EN12566-3/A1:2009, with published results of 11.5:19.2:8.4 mg/ltr (BOD:suspended solids:ammonia) — around 97% pollutant removal under test conditions.

Waste settles in a primary chamber before passing into an aeration chamber, where diffused air and bio-media complete treatment ahead of discharge to a drainage field or watercourse.

Size & options

Available from 4PE to 16PE. Choose gravity or pumped outlet depending on site levels, and internal or external compressor housing — external is recommended for a longer compressor life, and supplied as standard on 4PE and pumped models.

Key features

• Low running costs – energy-efficient compressor with minimal running costs

• Easy installation – Forsheda seal inlet & outlet for flexible jointing; optional risers available for deeper inverts

• Minimal maintenance – removable PVC pressure pipe/diffuser for easy cleaning; 32mm sludge return resists blockages

• High-spec bio-media (310m³ per m²) with membrane diffusers for even circulation, retained by stainless steel mesh

• Durable, discreet lid that blends into the surroundings while standing up to daily wear

• Integral lifting eyes and stabilising feet for safe handling and transport

• Unique 'keying-in' lip for secure anchoring into granular or concrete surrounds