Use Code SEWAGE5 for 5% Off Spare Part Orders Over £250

GRAF

Discover the full range of GRAF sewage treatment plants, designed to deliver industry-leading effluent quality with low energy usage and minimal maintenance. Ideal for off-mains properties, rural homes, and small commercial sites, the One2Clean system provides up to 99% pollutant removal using advanced SBR lifting technology.

Each tank in the range is CE-certified to EN12566-3, featuring a robust injection-moulded shell, quiet operation, and plug-and-play installation—no on-site wiring required. Plus, every system includes free commissioning by an approved GRAF UK service provider and is backed by a 10-year tank warranty.

Whether you need a system for a single dwelling or a larger household, the GRAF  range includes multiple capacity options, gravity or pumped outlets, and riser extensions for flexible installation. From 5PE to larger residential setups, this collection ensures compliance, efficiency, and peace of mind.

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What is a Sewage Treatment System?

A sewage treatment system for private properties processes wastewater from homes and businesses that are not connected to mains drainage. It removes solids, organic matter, and harmful bacteria through physical, chemical, and biological treatments, ensuring that the treated effluent meets environmental standards. Typically housed in a sewage treatment plant, these systems allow safe discharge into natural water sources, helping to prevent water pollution and comply with regulations for off-mains drainage solutions.

How do Sewage Treatment Systems work?

Sewage treatment systems use a combination of mechanical and biological processes to remove contaminants, solid waste, organic matter, pathogens, grease, and oil from sewage water and industrial wastewater. Once treated, the resulting effluent meets the required quality standards for safe discharge into natural watercourses. Common treatment methods include rotating biological contactors (RBC), aeration, sedimentation, and filtration.


There are many treatment system designs, but we only supply BS EN-certified systems that comply with industry regulations and come from trusted manufacturers known for reliable performance and excellent customer service.

How to Choose the Right Wastewater Treatment Tank for Your Needs

Selecting the right wastewater treatment tank depends on factors like local regulations, property size, soil conditions, household water usage, and the type of treatment system needed. If you are unsure what system you need give us a call on 01388 537050.