Concrete Sewage Treatment Systems for One-Off Homes

Building a new Home?


Upgrading an Existing Septic Tank?

The Sepcon BAF has become synonymous with highly efficient waste water treatment systems over the last 25 years.

The Sepcon BAF is manufactured to the highest standards and is certified to both EN12566-3 and the new S.R.66 National Certification- it also comes with a industry leading 10 year parts warranty!

Our renowned direct one-to-one personal service, high quality sewage systems, extremely competitive prices & 10 year components warranty means – you need look no further for your new build!

The Sepcon BAF System is proven for over 25 years as Ireland’s leading Sewage Treatment System.

What’s included with the Sepcon BAF – “The full package”

  • 10 Year Parts Warranty – the longest warranty available.
  • 5 Chambers in our plus system ensures maximum retention of solids throughout the treatment process.
  • Fully Certified to EN 12566-3 & S.R. 66.
  • Our tank is made from Super Strong Reinforced Precast Concrete (Not Plastic – so it will not crack or pop out of the ground)
  • Delivery & Installation of the Sepcon BAF System into the ground by our truck mounted crane.
  • Low Profile Lids and covers ensures the Sepcon BAF sits neatly and discreetly into your landscape.
  • Free On-Site Commissioning of the Sepcon BAF on delivery.
  • Free Armored Power Cable from the tank to the House/Garage – 20metres. (additional available)
  • Extra Risers are included to bring access manholes on the tank to the finished ground level up to 1m from the invert. (additional available)
  • A Proven & Ultra Reliable System for over 25 years in Ireland.
  • Low Invert from the inlet pipe to the base of the tank reduces the depth of the excavation, making the Sepcon BAF ideal for sites with bedrock.
  • No Expensive Computers. The Sepcon BAF system has maintenance friendly mechanics and does not rely on unnecessarily complex technology. This ensures long term viability.

Sepcon also provide:

  • Percolation Pipe Kits – made to order specifically for your site.
  • Distribution Boxes – 4 and 6 outlet boxes available.
  • Geotextile Membrane
  • Feed Pipe from the tank to the percolation
  • Complete Turnkey Installation – including groundworks.

How it works?

Our systems utilise BAF (Biological Aerated Filter) treatment technology which is industry renowned for its simplicity and high waste water treatment performance. BAF technology is highly effective, economical and extremely reliable as it does not use computers or maintenance intensive components.

In a nutshell, Simple, Economical and Reliable Waste Water Treatment!

Legend: 1 to 7

  1. Waste water from the dwelling flows through the inlet into the primary chamber.
  2. Heavy solids naturally settle and form as sludge in the bottom of this chamber.
  3. Effluent flows into the first aeration chamber where is lightly aerated to help treat the water.
  4. Additional surface area (bio-media) is in the aeration chambers to help bacteria to naturally grow to break down the waste water.
  5. Treated water then flows to the second aeration chamber for an additional level of treatment.
  6. The now pre-treated water then flows into the final settlement chamber and settles.
  7. Any remaining solids settle to the bottom where they are transferred back to the primary chamber by air siphon. This feature also prevents the water from stagnating during extended periods of non-use.
  8. The treated water is now clean and ready to be discharged from the Sepcon BAF to the percolation area / polishing filter.

Legend: A to E

  • A = Finished ground level. (Access manholes B & C are also extendable to suit different ground levels)
  • B = Desludging access.
  • C = Discrete main access & green control box to blend in with your landscape.
  • D = Gravity discharge option. (Site Dependent)
  • E = Pumped discharge option. (Site Dependent)

Is the Sepcon BAF Certified?

Yes, our systems are fully certified to EN12566-3 and the new S.R.66 National Requirements introduced by the NSAI & the Department of Environment, which came into force on the 1st January 2017.

A copy of the certification can be downloaded in the Technical Specifications section below.

Technical Specifications & Downloads (6 to 12PE)

System Design Population Number of Bedrooms Design Hydraulic Loading Parts Warranty Certification Drawing
6PE 1 to 4 900 L/Day 10 Years Download Download
7PE 4 to 5 1,050 L/Day 10 Years Download Download
8PE 4 to 6 1,200 L/Day 10 Years Download Download
12PE 5 to 10 1,800 L/Day 2 years Download Download

Note: We also provide a range of large BAF systems from 12PE to 500PE.

What puts the Sepcon BAF ahead?

We know that a waste water treatment system is not going to be on your daily agenda – and why should it be anyway? We all have lives to get on with..

You want to know your sewage system is working well and not causing hassle?Is that to much to ask? – It can be with some complex sewage treatment systems.

We believe a domestic waste water treatment system should be economical, easy to maintain and ultra reliable.

The Sepcon BAF has proven to match our ethos with almost 3 decades of proven success in Ireland coupled with a 5 year warranty and easy payment options over 24 or 36 months to back it up.

Did you know?


The Sepcon BAF System is trusted by Irish homeowners for over 25 years.


European EN12566-3 certification and SR66 National Certification.

Here to Stay

The Sepcon BAF System does NOT use custom made computers that can go out of production over time.

Protecting our Environment

Sepcon BAF Systems across Irelands collectively treat in excess of 1.5 million litres of waste water every day.

Electrical Consumption Compared to the Sepcon BAF

Aquamax by CMD Env. (17cent/Day Extra) + 91%
Oakstown BAF (15cent/Day Extra) + 82%
Molloy Precast Klaro E (7cent/Day Extra) + 36%
Carlow CCT Biogreen (17cent/Day Extra) + 90%
Biocycle (15cent/Day Extra) + 82%

Energy consumption comparison is based on a typical 4 bedroom dwelling designed to the EPA CoP 2009 using EN12566-3 & S.R.66:2015 certification published by PIA GMBH as of February 2017. The daily cost comparison is based on Electric Ireland’s standard unit rate of 0.1717 as published on their website for February 2017.

Can I use the Sepcon BAF if my planning permission states a different brand?

Yes, because the Sepcon BAF is fully certified and accepted across all local authorities in Ireland, you can use it in place of any other secondary system mentioned on your planning.

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    The Sepcon BAF is designed to treat domestic waste water from:

    • Washing Machines
    • Dishwashers
    • Sinks
    • Baths / Showers
    • Toilets