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Marsh Industries
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Ensign:Ultra™

$3,283.00
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The Marsh Ensign:Ultra sets the standard for domestic sewage treatment, combining proven performance with enhanced engineering. Building on the trusted design of the original Ensign, the Ultra model delivers even quieter operation, improved effluent quality, and higher overall efficiency — all without sacrificing ease of installation or affordability.

Tested and CE-approved to BS EN12566-3/A1:2009, this system delivers class-leading results with pollutant removal rates of up to 97% — helping homeowners and installers stay compliant with confidence.

With no internal moving parts, low running costs, and a full range of sizes from 4 to 50 PE, the Ensign:Ultra is the go-to solution for off-mains wastewater treatment.

KEY

  1. Inlet
  2. Primary settlement chamber
  3. Aeration chamber
  4. Compressor with alarm
  5. Compressor housing (External or internal options)
  6. RCD / Electrical connection
  7. PVC pressure pipe for diffuser(s)
  8. Bio-media
  9. Stainless steel mesh
  10. Final settlement chamber
  11. Sludge return
  12. Unique Polylok tertiary filter (Ensign:Ultra units)
  13. Outlet
  14. Access lid
  15. Integral lifting eyes
  16. Stabilising feet
  17. Unique ‘keying-in’ lip

 

 

Care & Maintenance & Installation

Annual emptying and servicing are recommended to maintain high performance. Inspect the blower, diffusers, bio media and Polylok tertiary filter, and replace or clean components as needed. Ensure the alarm and RCD box are working and pipework is free from blockages. When installing, follow Marsh's installation manual: prepare a stable concrete/granular base, allow for ventilation and access for maintenance, connect to inlet and outlet pipework using Forsheda seals, and backfill evenly with granular material. Delivery typically takes 1‑2 weeks; make sure the site is accessible for delivery and installation. Optional extras such as deep installation kits, pumped outlets and phosphate reduction modules should be considered where appropriate.

Delivery & Shipping

Delivery typically takes 1–2 weeks from the date of order. Units are delivered directly to site using trusted hauliers experienced in handling sewage treatment systems. The Ensign:Ultra™ is designed for easy installation, with integral lifting eyes and stabilising feet for safe handling and positioning.

Ensign Ultra sets the standard for domestic sewage treatment plants, offering outstanding reliability and efficiency. This advanced unit builds on the proven Ensign platform with improved aeration and process control to achieve 97% pollutant removal (BOD: 11.5 mg/l, Suspended Solids: 19.2 mg/l, Ammoniacal Nitrogen: 8.4 mg/l). Its energy-efficient compressor and internal recirculation reduce running costs and noise, while high-surface-area bio media and an integrated Polylok tertiary filter enhance effluent quality and protect drainage fields. The rugged GRP tank features a Forsheda seal, integral lifting eyes, stabilising feet and a keying-in lip for easy installation and long-term structural integrity. Optional deep installation kits, pumped outlets and phosphate reduction modules ensure flexibility for a range of site conditions. Certified to BS EN 12566-3/A1 with a 25-year structural guarantee, the Ensign Ultra provides peace of mind and superior performance for off-mains wastewater treatment.

Class-leading performance

Achieves 97% pollutant removal (BOD 11.5 mg/l, suspended solids 19.2 mg/l and ammoniacal nitrogen 8.4 mg/l) and is certified to BS EN 12566‑3 for peace of mind.

Low running costs & quiet operation

Energy‑efficient blower and internal recirculation reduce running costs and noise levels, ensuring quiet and economical operation.

  • Warranty
    25
  • Discharge To Surface Water
    Yes
  • Discharge To Drainage Field
    Yes & 15% size reduction
  • Power Supply Required
    Yes
  • Min Person
    4
  • Max Person
    50
  • Tank Empty Frequency
    Annual

Ensign Ultra Key Features

- Proven Ensign treatment technology delivers reliable, efficient performance with enhanced aeration and process control.
- Quiet, energy-efficient compressor and internal recirculation minimise running costs and noise.
- High-specification bio media with large surface area and integrated Polylok tertiary filter achieve class-leading effluent quality.
- Heavy-duty GRP tank with Forsheda seal, integral lifting eyes, stabilising feet and keying-in lip for easy installation.
- Optional deep installation kits, pumped outlets and phosphate reduction modules provide flexibility for site-specific needs.
- CE marked and tested to BS EN 12566-3 with a 25-year structural guarantee.• Proven Ensign treatment technology delivers reliable, efficient performance with enhanced aeration and process control.
• Quiet, energy-efficient compressor and internal recirculation minimise running costs and noise.
• High-specification bio media with large surface area and integrated Polylok tertiary filter achieve class-leading effluent quality.
• Heavy-duty GRP tank with Forsheda seal, integral lifting eyes, stabilising feet and keying-in lip for easy installation.
• Optional deep installation kits, pumped outlets and phosphate reduction modules provide flexibility for site-specific needs.
• CE marked and tested to BS EN 12566-3 with a 25-year structural guarantee.

Engineered for superior reliability and performance

The Ensign Ultra represents the pinnacle of domestic sewage treatment technology, combining proven reliability with advanced engineering. Its enhanced aeration system and integrated Polylok tertiary filter deliver exceptional effluent quality, achieving 97% pollutant removal. The robust GRP construction, Forsheda seals, and comprehensive 25-year structural guarantee ensure decades of trouble-free operation. With quiet, energy-efficient operation and flexible installation options, the Ensign Ultra is the ideal solution for off-mains wastewater treatment.

Shallow Ensign Ultra

Ensign:Ultra™
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Ensign:Standard™
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Price
Price
From $3,283.00
From $2,399.00 $2,810.00
Delivery Timeframe
Delivery Timeframe
2-3 Weeks
1-2 Weeks
Shallow Dig
Shallow Dig
Yes
No
Min Person Required
Min Person Required
4
2
Max Person Capacity
Max Person Capacity
50
50
Required Emptying
Required Emptying
Annual emptying & periodic blower and media inspection
Annual
Requires Power Supply
Requires Power Supply
Yes
Yes
Suitable For Drainage Fields
Suitable For Drainage Fields
Yes & 15% size reduction
Yes & 15% size reduction
Can Discharge To Water
Can Discharge To Water
Yes
Yes
Warranty Years
Warranty Years
25
10
Product variants
Product variantsPerson Capacity
  • 4,
  • 6,
  • 8,
  • 10,
  • 12,
  • 16,
  • 20,
  • 25,
  • 30,
  • 35,
  • 40,
  • 45,
  • 50
Outlet Type
  • Gravity,
  • Pumped
Size
  • 4 PE,
  • 6 PE,
  • 8 PE,
  • 10 PE,
  • 12 PE,
  • 16 PE,
  • 20 PE,
  • 25 PE,
  • 30 PE,
  • 35 PE,
  • 40 PE,
  • 45 PE,
  • 50 PE
Outlet Type
  • Gravity,
  • Pumped

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