Waste water treatment

Conder ASP

Allpump Services plan, install, and maintain a range of waste water treatment solutions across the UK.

Among our range is the "Conder ASP" produced by Premier Tech Aqua. Please find below more details about their product along with links to their site and a PDF copy of the details.

Conder ASP

Activated Sludge Process
Conder treatmant plant being installed
The partner of choice
Premier Tech Aqua
40 years passion

Sewage treatment plant for residential and commercial projects

The Conder ASP Package Sewage Treatment Plant is the perfect solution for residential and commercial projects where mains drainage is unavailable.

The plant will serve a population range from 6-25 and is fast becoming the industry’s system of choice for reliability, ease and low installation costs.

Installed to treat wastewater with minimal impact on the environment, typical applications include single dwellings, small communities or developments, refurbishment and rural barn conversions.

Conder ASP

Superior Technical Performance

The highly successful Conder ASP is designed and tested in accordance with BS EN12566-3:2005 and the British Water Code of Practice for Flows and Loads as well as being CE marked. The standard range plants produce an effluent quality of better than 20mg/L BOD; 30 mg/L SS; 20 mg/L NHȝ.

Complete Below Ground Installation

Premier Tech Aqua has designed the Conder ASP to have a minimal visual impact on site location. This includes a complete below ground installation and a quiet and odourless operation assisted by a compact and innovative design.

Low Costs

The Conder ASP offers superior technical performance at a competitive price, offering real value for your money without compromising on quality. The on-going maintenance and running costs for the Conder ASP are extremely low as well as having a better than average emptying frequency. This provides an overall competitively priced product for the duration of its lifetime.

Quality, Adaptable Design

Premier Tech Aqua has completed thousands of Conder ASP installations across the globe and has pioneered the development of packaged sewage treatment plants. The Conder ASP consists of a state-of-the-art GRP high strength structure and includes remote blow housing.

The adaptable design offers the availability of an integral pumped system, deeper inverts (with supply of a standard extension kit), choice of pumped influent or effluent and is suitable for discharge to ground or watercourse (subject to relevant exemption, consent and licence).

How the ASP Works

The Conder ASP treatment plant comprises of a single tank and within this tank there is an inner central bio-zone chamber and an outer settlement zone. Sewage enters and leaves the treatment plant through the following process:

Demonstration of tank internals

Step 1

The plant accepts and treats the incoming sewage in the central bio-zone chamber, with use of the extended aeration principle.

Step 2

A simple coarse bubble diffuser, housed in a draft tube, introduces the air that provides the oxygen to the bacteria, which then treats the sewage.

Step 3

The bio-zone then retains the mixture of sewage and bacteria until the level of treatment has been achieved.

Step 4

The treated (final) effluent subsequently leaves the plant over a weir, at the outlet level, that extends around the circumference of the tank. The movement of the fluid through the whole system is by gravity displacement. The option for an integral final effluent pumped discharge is available.

Step 5

The treated effluent then enters the settlement zone where settlement takes place. The settled solids are drawn back towards the draft tube, housing the diffuser and are returned via the airlift principle to the bio-zone for further treatment.


The table below can be used as a specification in choosing the correct Conder ASP for your project.

All applications should be specified to comply with the British Water Code of Practice for Flows and Loads. Further advice and assistance is available from our experienced internal and external sales teams. Site visits and assessments are recommended to ensure the correct equipment is proposed prior to installation.

Conder ASP Range of Package Treatment Plants
Unit Measurements* ASP06 ASP08 ASP12 ASP16 ASP20 ASP25
Population Equivalent 06 08 12 16 20 25
Hydraulic Load litres/day 1200 1600 2400 3200 4000 5000
Organic Load gBOD5/day 360 480 720 960 1200 1500
Ammonia as Nitrogen gNH3/day 48 64 96 128 160 200
Tank Diameter mm A 1970 1970 1970 1970 1970 1970
Standard Inlet Invert to top of tank shell mm B** 750 750 750 750 750 750
Inlet Invert to base mm C 1500 1500 1800 1900 2000 2300
Outlet Invert to base mm D 1400 1400 1700 1800 1900 2200
Overall Depth (excluding access cover height) mm E** 2250 2250 2550 2650 2750 3050
Pipework Fitting mm 110 110 110 110 110 110
Access Cover Size; Square mm 750 750 750 750 750 750
Plant Weight kg 230 230 260 300 360 440

* To select a system with an integral final effluent pump add a ‘P’ suffix e.g. ASP06P.
** Deeper installation depth can be accommodated with extension shafts.


The Conder ASP Package Sewage Treatment Plant requires a relatively low cost and easy installation process, typically using only a 200 mm deep concrete base followed by a pea shingle or self compacting backfill.

Premier Tech Aqua work closely with a nationwide network of installation partners and detailed installation guidelines are provided for each product.

All electrical work should be carried out in accordance with current regulations (for example NIC EIC/Building Regulations).

Extension Kit

Deeper inverts can be accommodated by means of an access extension kit which is available in a 1.0 m length. These are designed to be cut to size on site and can also be retrofitted, again on site, taking away the worry of installing at incorrect levels.

Package Pump Station

Inlet sewage and final effluent pump chambers are available in single or dual units, at varying inverts, and are designed to suit on site requirements. Again these can be retrofitted, if required.


Through a nationwide network of British Water accredited service engineers, Premier Tech Aqua offer a comprehensive range of services including commissioning and on-going service contracts. Please contact the Premier Tech Aqua sales team for further information.

Extended Warranty

All Conder ASP products come with an automatic 12-month warranty. Extended 5-year warranties can be obtained for free by visiting our website and completing in a short Warranty Activation Form or the form supplied with the plant.