Sewage Treatment Plants




  • impact resistant body moulded in one-piece polyethylene
  • wide base for stability and ease of handling and storage
  • sturdy lifting eyes for easy handling and installation
  • achieves Royal Commission standards for effluent quality under normal domestic conditions
  • powered by a small, near silent air compressor
  • corrosion resistant

How does it work?

Crude wastewater enters the main outer chamber (1) where the initial settlement takes place, with the heaviest solids sinking and the floating matter rising. The liquor from the main section is transferred to the central chamber (2) where it’s continuously aerated by the fine bubble diffuser (4) which encourages bacteria to provide the second stage of treatment.

The mid-section of this treated effluent is then removed from the chamber through a calming pipe (5) which allows a further brief settlement before discharge. (6)

The air compressor (7) runs continuously. It is contained within the neck of the tank and it’s accessible for maintenance if required.
Easy access is available to both chambers for dislodging which is an annual operation.


1. primary settlement tank

2. reactor vessel

3. transfer pipe

4. fine bubble diffuser

5. calming pipe
6. outlet pipe

7. air compressor



  • population served: 1-6
  • total capacity 3800L
  • low inverts available on order


  • population served 7-12
  • total capacity 6000L
  • low inverts available on order





  • market leading pollutant removal level of 97%
  • 24 month service period reduces operating costs
  • cost effective installation
  • virtually silent operation

1. 110 - 160mm inlet depending on model

2. primary settlement chamber

3. aeration chamber

4. final settlement chamber

5. 110 - 160mm outlet depending on model

6. 160mm capped lid: desludge point

7. electrical isolator switch

8. air compressor with warning system (240V)

9. 760mm manway lid: bolted down and sealed

10. 160mm capped lid: desludge point

11. bio media

12. bubble diffuser

How does it work?

The Balmoral Hydroclear system incorporates a full size three chamber design, i.e., primary settlement, aeration chamber and final settlement.

Within the primary settlement chamber, large solids are removed by settlement flotation. An accumulation forms at the base of the tank and is removed annually or biennially by desludging.


The clarified water then passes to the biological reactor where it is treated to remove the dissolved constituents. Mobile media elements support large bacterial populations within the reaction chamber while induced air promotes complete mixing ensuring that full treatment is achieved.


Unlike conventional media beds, MBBR systems are self-cleaning and unable to become blocked through channelling. Media interactions produce a sloughing effect that removes excess bacteria thus ensuring continuous regrowth, optimising overall reactor efficiency.


The treated effluent and sloughed off bacteria flows into the final settlement chamber where any remaining small solids are removed prior to the clarified affluent being discharged from plant.



  • population served 1-6
  • total capacity 4440L



  • population served 7-12
  • total capacity 5950L


Larger sizes available on order.

For free advice and prices call us on 01597 829307 / 823087

Caerfagu opening times:

Mon - Fri
8.00am - 1.00pm
1.30pm - 5.00pm


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