The Harlequin CAP9 is a compact sewage treatment plant designed specifically for domestic installations for up to 9 inhabitants (the equivalent of up to a 7 bedroom house). It is a Continuous aeration Plant which operates using a unique bio-media system and delivers a pollutant removal level of 96.2% whilst also combating common problems associated with small packaged domestic plants such as media blockage and inadequate oxygen supply.


Population served: 6-9

Max.hydraulic load (l/day): 1800        Organic load (g BOD/day): 510

Capacity: 3600 litres

Diameter: 1840mm    Height: 2180mm 

Energy usage (kWh/day): 1.8

Desludging interval: 12 months


Moulded from durable medium density polyethylene material.

110mm inlet and outlet connections

Integrated lifting eyes for ease of handling & installation

Fully secured 450mm pedestrian duty, flush fitting manhole cover complies with statutory regulations

Above ground air blower housing delivers more reliable and efficient operation and allows easy access for maintenance

Easy access to bubble diffuser within the tank

Similar to an MBBR system there is no fixed media eliminating blockages

Virtually silent operation

Compact size and light weight reduces installation costs 

Mechanically reliable with no moving parts or electrics within the tank

Certified to EN12566-3

Optional Equipment: Air Blower function Alarm, Pumped Outlet, 300mm manhole riser(s)


BIO MEDIA SYSTEM: Similar to the MBBR system, there is no fixed media eliminating blockages that are commonly found in smaller treatment plants.

DURABLE & STABLE PRODUCT: Made from tough durable polyethylene, it is easy to transport and has a wide base for stability.

LOW NOISE: With a near silent air compressor housed beneath the flat lid, the operation of the system is virtually silent

EASY MAINTENANCE: The only component that requires maintenance is the Compressor. This is located in a separate chamber within the lid that allows access to the compressor without coming in to contact with any sewage.

SAVES MONEY: With an easy installation due to the systems compact size and light weight, it also promotes low maintenance reducing costs.


Prices quoted include delivery to mainland UK. Deliveries will be made by a 45ft articulated lorry and it is the customer's responsibility to ensure adequate access plus offloading. Offloading of heavy items should be made by forklift or similar lifting equipment. There should be sufficient access for a 45ft articulated lorry to safely enter and exit the delivery address. In particular, all access roads must be capable of accommodating a vehicle up to 40 tonnes in weight. 

There must be no obstacles e.g. overhanging trees, low hanging cables, low bridges etc. below 4.6 metres height which would restrict the delivery vehicle from gaining access to the delivery address.

The customer or the customer’s representative must be on site to sign for the delivery.

If there is any doubt about delivery access or offloading please contact us to discuss options available. Please allow a minimum of 10 days for delivery.


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HydroClear CAP9 - 9 pop Sewage Treatment Plant

  • Brand: Harlequin
  • Product Code: Hydroclear CAP9
  • Availability: In Stock
  • £2,340.00

  • Ex VAT: £1,950.00