Domestic Wastewater Treatment Systems

Discover our range of domestic on-site wastewater treatment systems, also known as packaged sewage treatment plants. Manufactured in accordance with EN12566 certification, the EPA Code of Practice 2021, S.R. 66:2015, and the Building Regulations Technical Guidance Document H. Our wastewater treatment systems are designed for engineers, installers, and homeowners.

Wastewater specialists: market-leading SBR technology with minimum energy consumption and maximum treatment efficiency.

✓ Delivers superior wastewater treatment with up to 99% efficiency, ensuring the highest quality effluent.

✓ Comes with a durable outdoor cabinet as standard to protect electrical components.

✓ Designed for efficiency, reducing operational costs and maintenance requirements for homeowners.

✓ Compact design for projects that are difficult to access, have limited space, or have challenging ground conditions.

Protecting our customers and the environment

GRAF Wastewater Treatment System

The GRAF one2clean wastewater treatment system is the benchmark for low running costs and treatment efficiency. Available in both gravity and pumped discharge options, it seamlessly integrates with gravity percolation trenches, a low-pressure pipe network (soil polishing filter), or a tertiary filter to meet planning application requirements and ensure compliance with local authorities. Designed for energy efficiency and minimal maintenance, it delivers exceptional performance while keeping operational costs low, making it an ideal, cost-effective solution for homeowners.

✓ Safely treat and dispose of your wastewater.

✓ Available in gravity or pumped discharge.

✓ Suitable for 3-7 bedrooms houses.

✓ Operates in cycles and only runs for 11 hours each day.

✓ Silent and odourless treatment process - operates at 36 decibels.

✓ No moving parts or electrical components in the tank.

✓ Can be installed in driveways using a vehicular cover.

✓ Free delivery and commissioning anywhere in Ireland.

More information

  • The design process for a wastewater treatment system begins with an EPA site suitability assessment, a critical step to determine the most appropriate system for your site. This assessment evaluates soil percolation, topography, and site-specific conditions, ensuring compliance with EPA and local county council regulations. Key considerations include maintaining minimum separation distances from the water table, bedrock, property boundaries, wells, nearby dwellings, and public roads. These factors influence the safe treatment and disposal of wastewater and determine whether standard wastewater treatment systems with percolation trenches, low-pressure pipe networks, or advanced tertiary filters are required.

  • Each wastewater treatment system comes complete with everything needed for efficient and reliable operation. The supply includes the wastewater tank, which is designed to robustly contain and process wastewater alongside advanced SBR (Sequencing Batch Reactor) technology for effective and efficient wastewater treatment. An outdoor cabinet is also provided, offering weather-resistant housing for essential control components. Additionally, we can supply optional extras on request, such as additional risers and a vehicular cover designed to withstand traffic, making it ideal for systems installed in driveways.

  • Our wastewater treatment systems are designed with installation in mind, offering factory-designed lifting points and pre-fitted lifting straps to ensure quick and straightforward handling. The lightweight modular tank design makes transport and placement easy, even on sites with limited access or poor ground conditions. For most sites, we recommend a gravel backfill, while a lean mix is preferred in areas with a high water table to ensure stability. Each system is delivered with all necessary fittings and connections, making the installation process efficient and hassle-free. With comprehensive assistance and clear guidelines provided by our experts, you can confidently complete the installation, even in challenging locations.

  • Once the wastewater treatment system has been installed and power is available, one of our expert technicians will commission the system to ensure it has been installed correctly and is fully operational. This process includes a thorough check of all components to verify proper functionality and compliance with installation standards. Upon completion, we provide a commissioning certification, digitally delivered within minutes, which can be shared directly with your engineer for their records. This ensures peace of mind and confirms that your system is ready to perform efficiently.

  • Regular service and maintenance are essential to keep your on-site wastewater treatment system performing at its best and to extend the lifespan of its components. Typically, one routine service callout is required every 12 months, during which our skilled technicians perform a comprehensive inspection and maintenance process. This includes checking the control panel and operation/fault menu, replacing the air filter (if applicable), and conducting functional checks of all mechanical and electrical components such as the control panel, air compressor, water pump, valves, high-level alarm, and pipework. The structural condition of the treatment system, including the percolation area, is also inspected.

    Additional services may include flushing and cleaning the low-pressure pipe network, measuring pH and oxygen concentration levels for optimising air compressor operating times, conducting a sludge volume proportion test (SV30) to determine accurate de-sludging intervals, and effluent sampling with laboratory testing, where required. Upon completion of the service, you will receive a full digital report within minutes, along with automated reminders for future service calls. Our services also include providing receipts for your Local County Council as part of your service and maintenance contract or planning application, ensuring your system complies with all relevant regulations.

Speak to a member of our team

Speak to a member of our team who specialises in wastewater treatment systems for new and existing developments.

Frequently asked questions

  • You need a wastewater treatment system when a septic tank isn’t suitable or connecting to a main sewer isn’t possible. Septic tanks require certain distances from water supplies, wells, or property boundaries for example, which can’t always be met, especially on small or awkward sites. In rural areas, connecting to a main sewer can be very expensive or simply not an option.

  • GRAF one2clean wastewater treatment systems are smart and simple, only requiring 0.63kwh per day.

  • An EPA site suitability assessment is a critical step to determine the most appropriate system for your site. Our wastewater treatment system is available in gravity or pumped discharge and can be used with any type of percolation area.

  • The GRAF one2clean Wastewater treatment system operates in three phases:

    Aeration Phase

    In this phase, wastewater flows into the treatment area where oxygen is introduced by a diffuser located at the bottom of the tank. The added oxygen creates an ideal environment for naturally occurring bacteria to thrive. These bacteria immediately begin breaking down the organic waste, ensuring the treatment process starts right away.

    Settlement Phase

    Following aeration, the system enters a pause to allow the contents to settle. During this time, heavier solids sink to the bottom, forming a layer of sludge, while the clearer, treated water rises to the top. This prepares the water for the next stage of the process.

    Discharge Phase

    In the final step, the clarified water at the top of the tank flows by gravity or in some cases is pumped to your percolation area where the treated wastewater discharges to groundwater.

  • The type of percolation area that is suitable for your site will be specified in your EPA site suitability assessment and part of your planning application. Without a percolation test, it is almost impossible to determine which type of system is right for you. Percolation areas can be traditional gravity trenches (percolation pipes), low-pressure pipe networks (soil polishing filters) or advanced tertiary filters.

  • Your wastewater tank needs to be a minimum of 7 metres from the house, and your percolation area needs to be a minimum of 10 metres from the house.

  • For most sites, we recommend a gravel backfill, while a lean mix is preferred in areas with a high water table to ensure stability.

  • GRAF one2clean operates at only 36 decibels meaning it is extremely quiet relative to other wastewater treatment systems available.

  • Your wastewater treatment system will require de-sludging (emptying). This is determined by the sludge build-up and can be measured during a routine service callout. Local authorities require annual de-sludging to ensure compliance with regulations.

  • We recommend servicing your wastewater treatment system annually to ensure maximum performance and preserve the useful life of your components. In many cases, the local authority will look for a service agreement as part of your planning application. We can provide service contracts tailored to your specific requirements.

  • Our wastewater treatment systems are manufactured per EN12566 certification, the EPA Code of Practice 2021, S.R. 66:2015, and the Building Regulations Technical Guidance Document H.

  • The outdoor cabinet housing your components can be a maximum of 15 metres from the wastewater treatment system. This gives you the flexibility to decide where you would like the cabinet to go.

  • Yes, you will need to bring a power supply to your wastewater treatment system. Usually, this is a 3-core 2.5 SWA cable glanded into the outdoor cabinet with a double outdoor socket. Instructions are provided for your electrician upon delivery of the system.

  • You can contact our office anytime to book a service callout or get more information about your on-site wastewater treatment system.

  • Once the wastewater treatment system has been installed and power is available, you can contact our service department to book your commissioning.

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