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Klargester BioAir 7 Sewage Treatment System (up to 25 person)

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 The new Klargester BioAir 7 gravity fed wastewater treatment plant uses aerated technology to deliver a high level of water discharge quality.

Klargester BioAir Economy models are supplied with an isolator switch with power failure light (in the blower box) and should be mounted externally at a point where it is easily visible from the property.

Downloadable Documents

pdfKlargester BioAir Data Sheet

pdfKlargester BioAir 7 Sales Drawing (Gravity Only)

pdfKlargester BioAir 4, 6, 7 & 8 Installation Manual (GRP Models)

Offering flexible installation options to suit a variety of domestic sites and a low impact visual footprint, Klargester BioAir Economy is an affordable choice for your domestic wastewater treatment solution.

Product Benefits: 

  • Suitable for shallow dig Installations
  • Suitable for use in traffic areas (structural design advice required by others)
  • Low level visibility
  • No plastic media
  • Improved effluent quality – BOD5 97.5%
  • Third party tested to EN 12566-3
  • Easy to install and operate
  • Supplied with isolator switch and failure light
  • Affordable service plans available
  • Robust and Lightweight
  • 12 months warranty* (terms apply)

Typical Applications

  • Single & Multiple Homes
  • Light Industrial Premises
  • Small Offices
  • Farms
  • Barn Conversions

Product Details

  • Product Code: KLA
  • Customer Offloading: Customer Offloading
  • Delivery: Free Delivery
  • Diameter: 1920mm
  • Free Site Survey: Free Site Survey
  • HIAB Available: HIAB Available
  • Material: GRP
  • Tank Use: Below Ground, Sewage


Our shipping costs cover most of the UK - however, parts of England, Scottish Highlands and Islands including areas north of the Glasgow / Edinburgh border, Isle of Wight, Channel Islands, Isle of Man, Anglesey, Western Isles, Shetland Islands, Orkney Islands, Isles of Scilly, Northern Ireland and the Republic of Ireland may cost more.

Please call before ordering if the delivery postcode is listed below. There may be additional shipping costs. AB, BT, CA, CT, DD, DG, EH, FK, G, GY, IM, IV, JE, KA, KW, KY, LD, LL, ML, PA, PH, PO 30-41 (Isle of Wight), SA, SY, TD, TN, TR, ZE Southern Ireland

Our lead times should only be used as a guide and are subject to change.


Unless a hi-ab delivery has been booked at additional cost, it is the customer's responsibility to offload with suitable equipment on the day of delivery and a failed delivery may result in additional charges.

We recommend installers and/or plant hire & materials to install such as excavators, aggregates etc are not booked until you are in receipt of the goods.  Direct drainage cannot be held responsible for costs incurred due to unforeseen delays, please see our terms for more details.

If you have any questions regarding your delivery, please contact the Sales Team on 01388537050




BioAir 7

Population Equivalent



Daily Flow



Daily Load

kg BOD5/d



Outlet invert









Installation depth



Inlet invert



Inlet pipe work*


110 dia

Outlet pipe work*


110 dia

Material Construction



Unit Weight



** Tank weights based on 500mm Invert

If you are unsure or need help we are here to help! Give our friendly team a call on 01388 537 050 or email

Free Delivery is available to the whole of the UK Mainland (including Scotland) and is subject to suitable access for a large goods vehicle. 

This product is delivered to the kerb and it is the customers responsibility to provide suitable mechanical offloading facilities (eg. Loader or Excavator) to offload this tank safely. Please specify any access restrictions on your order.

If we can do anything to make your purchase more accommodating call our friendly team on 01388 537 050 or email prior to placing your order.

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