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Shallow Ensign:Ultra™

£2,930.00
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The Marsh Ensign:Ultra Shallow Dig brings premium treatment technology to sites where depth is limited but performance can’t be compromised. With a compact height of just 1.6m, it's ideal for installs where traditional tanks can’t go — such as rocky ground, high water tables, or tight access locations.

Backed by CE certification and tested to BS EN12566-3/A1:2009, the Ensign:Ultra delivers industry-leading effluent results:
11.5:19.2:8.4 mg/l (BOD:Suspended Solids:Ammonia) — equating to 97% pollutant removal.

The Ultra model takes everything great about the standard Ensign and enhances it further — adding quieter operation, improved effluent quality, and the Polylok tertiary filter for even better protection of your drainage field.

Whether you’re a homeowner, developer, or installer, this is one of the best shallow dig options on the market — with no compromise on compliance or performance.

 

 

 

Care & Maintenance & Installation

Annual emptying and servicing is recommended to ensure optimal performance. Inspect the air blower, high-surface-area media and tertiary filter periodically and replace consumables as needed. Keep the air blower housing clear of debris and ensure the alarm and RCD protections are functioning. In high usage sites or challenging conditions, more frequent inspection may be required.

Delivery typically takes 2‑3 weeks. The shallow dig design reduces excavation depth and installation time. Ensure adequate clearance for lifting the tank and that the site allows for proper drainage field or discharge arrangement. Optional accessories such as deep installation kits, pumped outlets and phosphate reduction modules are available to suit site conditions.

Delivery & Shipping

Delivery typically takes 2–3 weeks from the date of order. Units are delivered directly to site using trusted hauliers experienced in handling sewage treatment systems. The Shallow Ensign:Ultra™ is designed for easy installation, with its compact 1.6m height making it ideal for sites with challenging ground conditions or limited excavation depth.

Shallow Ensign: Ultra is a compact treatment plant designed for sites where installation depth is limited. With a height of just 1.6 m, it’s ideal for rocky ground, high water tables or tight access conditions. Despite its shallow profile, it delivers exceptional treatment performance with 97% pollutant removal (BOD: 11.5 mg/l, Suspended Solids: 19.2 mg/l, Ammonia: 8.4 mg/l). The Ultra model builds on the proven Ensign platform with quieter operation, improved process efficiency and an integrated Polylok tertiary filter to enhance effluent quality and protect your drainage field. Tested to BS EN12566-3/A1:2009 and CE certified, it offers reliable, long-term treatment with a 25-year structural guarantee.

Shallow dig design (1.6 m height)

Low-profile 1.6 m height makes installation easier in rocky ground, high water table or restricted access sites.

Durable GRP shell & high media surface area

Heavy-duty GRP shell and high-surface-area media provide long-term durability and efficient treatment.

  • Warranty
    25
  • Discharge To Surface Water
    Yes
  • Discharge To Drainage Field
    Yes & 15% size reduction
  • Power Supply Required
    Yes
  • Min Person
    6
  • Max Person
    35
  • Tank Empty Frequency
    Annual

Shallow Ensign Ultra Key Features

• Shallow dig design (1.6 m height) allows installation on difficult sites.
• Forsheda seal for simple installation and leak‑free connection.
• Silent compressor with internal or external housing and RCD box.
• High‑spec bio‑media and stainless steel mesh for efficient treatment.
• Integrated Polylok tertiary filter reduces BOD and suspended solids by 40%.
• Heavy‑duty GRP shell with integral lifting eyes, stabilising feet and keying‑in lip.
• Optional deep installation kits, pumped outlets and phosphate reduction modules available.
• Tested to BS EN 12566‑3/A1:2009, CE certified with 25‑year structural guarantee.

Engineered for shallow dig performance

Shallow Ensign Ultra™ utilises a compact, shallow dig tank design combined with an air-driven treatment process and high-surface-area bio media to deliver exceptional effluent quality. An integrated Polylok tertiary filter further improves performance, while the heavy-duty GRP shell with lifting eyes and stabilising feet ensures robust installation. Quiet running compressors and optional deep installation kits, pumped outlets and phosphate reduction modules provide flexibility and simple installation.Shallow Ensign Ultra™ utilises a compact, shallow dig tank design combined with an air-driven treatment process and high-surface-area bio media to deliver exceptional effluent quality. An integrated Polylok tertiary filter further improves performance, while the heavy-duty GRP shell with lifting eyes and stabilising feet ensures robust installation. Quiet running compressors and optional deep installation kits, pumped outlets and phosphate reduction modules provide flexibility and simple installation.

Shallow Ensign Ultra

Population equivalent range: 6-35 PE

Shallow Ensign:Standard™
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Shallow Ensign:Ultra™
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Price
Price
From £2,730.00
From £2,930.00
Delivery Timeframe
Delivery Timeframe
2-3 weeks
2-3 Weeks
Shallow Dig
Shallow Dig
Yes - 1.6m height
Yes
Min Person Required
Min Person Required
6
6
Max Person Capacity
Max Person Capacity
35
35
Required Emptying
Required Emptying
Annual inspection recommended
Annual emptying & periodic blower and media inspection
Requires Power Supply
Requires Power Supply
No
Yes
Suitable For Drainage Fields
Suitable For Drainage Fields
Yes
Yes & 15% size reduction
Can Discharge To Water
Can Discharge To Water
Yes
Yes
Warranty Years
Warranty Years
25
25
Product variants
Product variantsPerson Capacity
  • 6,
  • 8,
  • 10,
  • 12,
  • 16,
  • 20,
  • 25,
  • 30,
  • 35
Outlet Type
  • Gravity,
  • Pumped
Person Capacity
  • 6,
  • 8,
  • 10,
  • 12,
  • 16,
  • 20,
  • 25,
  • 30,
  • 35
Outlet Type
  • Gravity,
  • Pumped

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