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FLI Precast Solutions

FLI Precast Solutions (formerly FLI Carlow) provide design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Our markets include Water, Wastewater, Energy and Storm Attenuation in the UK & Ireland and bespoke projects globally.

SERVICES INCLUDE

Design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems.
Design to national and international water industry standards and our semi-precast modular designs make us the industry leader in off-site concrete engineering and manufacture.
By early involvement and integrating with our clients’ design teams we can accelerate and improve design optimisation and reduce cost. The value is in the solution, and off-site manufacturing and fabrication leads to higher efficiencies and lower risks and costs.
Framework agreements enable us to add more value through collaboration, innovation, economies of scale, supply chain partnering and cost management.
Our products and designs are engineered to provide solutions to many challenges facing our clients: water retention, water storage, water conveyancing, water management, water treatment, fire-resistance criteria, chemical resistance parameters, infrastructural products, retaining walls, coastal erosion, decorative walls, to name a few.
We are a solutions provider using innovative off-site concrete engineering and our industry leading semi-precast modular designs.
The company is part of the FLI Group which is a diversified group of companies providing environmental solutions, services and technologies to private and public sector customers in the UK, France, Ireland and throughout the world.

PRODUCTS INCLUDE

Service reservoirs
Process settlement tanks (PST / HST / FST / etc)
Storm & attenuation tanks (network or site based)
Process structures (ASP / TSR / GAC / RGF / etc)
MCC service foundations
Bund wall system
Chambers
Channel & lids
Comms chambers
Multi-purpose chambers
Bespoke culverts
Holding tanks
Barriers
Demountable fence supports (international airport approved)
Ballast blocks
Dry flow channelling
Foundation bases
Blast fence supports

Alderney WTW (2025)

Water treatment works upgrade utilising advanced modular ozonated ceramic membrane technology

Bidford-on-Avon STW (2025)

Reaching an oxidation ditch solution for increased FFT and the introduction of phosphorus, ammonia and iron consents

Guildford STW (2025)

Civils work nears completion of the brand new sewage treatment works on regenerated wasteland which will serve a forecasted PE of 125,000

Knostrop STW (2025)

Enhanced biological phosphorus and tertiary solids removal plants achieve tightened WFD consents with reduced energy consumption

Saggart Reservoir (2025)

Reservoir expansion and on-site electro-chlorination plant to enhance storage, resilience, and sustainability for the Greater Dublin Area’s water supply

Towcester WRC (2025)

Addressing issues with storage capacity, flow capacity, phosphorus levels & growth requirements, to maintain the high standard that Anglian Water aspire to achieve

Condensed innovated ASP solution for an increased FFT and the introduction of a phosphorus permit and tightening of an existing ammonia consent

Boherbue Wastewater Treatment Plant (2024)

A flagship project for sustainable and carbon saving treatment processes setting a precedent for industry-wide innovation and best practices

Embsay WTW (2024)

Embsay Water Treatment Works is a standalone 24 ML/d water treatment works operated by Yorkshire Water (YW) and located in the Yorkshire Dales National Park, providing clean water to over 15,000 people in Skipton and surrounding areas. The existing works comprises of clarifiers, rapid gravity filters and a chlorine contact tank with associated chemical dosing. […]

Guildford STW (2024)

The challenges of constructing a new sewage treatment plant on an historical landfill site

Llyn y Fan Fach Reservoir (2024)

Grade II listed structure that underwent refurbishment to address safety concerns in the draw-off tower and spillway

Red Doles CSO (2024)

The Red Doles Combined Sewer Overflow (CSO) neighbours the Huddersfield Broad Canal and a Network Rail bridge. The CSO serves a catchment covering approximately 3.8km2, predominantly consisting of residential properties and accommodating around 8512 people. The majority of the Fartown area of Huddersfield drainage operates as a combined system, with Red Doles receiving flows from […]

Springwell Service Reservoir (2024)

Design and construction of a 43 ML semi-precast concrete reservoir to provide resilience in South Tyneside and Wearside

Alderney WTW (2023)

In 2015, Bournemouth Water was acquired by Pennon Group, who already owned South West Water (SWW). Alderney WTW, located in the north of Bournemouth, is a strategically important water treatment works that supply high quality drinking water to approximately 375,000 customers – nearly 75% of the homes and businesses in Bournemouth Water’s operational area. Alderney […]

Guildford STW (2023)

Guildford Borough Council (GBC) are progressing with the development of approximately 41 hectares of brownfield land located along the west bank of the River Wey as it runs through central Guildford and north through Slyfield Industrial Estate. Guildford Sewage Treatment Works (STW) lies within this land and requires relocation in order to enable the development […]

Knostrop STW (2023)

Knostrop Sewage Treatment Works (STW) is Yorkshire Water’s largest wastewater treatment site, serving a population equivalent of 990,000 and a full flow to treatment (FFT) of 5600 l/s. The WINEP Programme requires Yorkshire Water (YW) to achieve compliance with the new Total Phosphorus and Total Iron permit levels at 80 wastewater treatment works, including Knostrop. […]

Stithians WTW (2023)

Upgrading the existing water treatment process with GAC and UV treatment to meet long term taste and odour targets

Ufton Nervet WTW (2023)

Ufton Nervet WTW is a groundwater treatment site located in the Kennet Valley Water Resource Zone, to the south of Reading and supplies an ‘island zone’ of approximately 12,000 properties. Groundwater is pumped through pressure filters for iron removal after which chlorine is dosed before flows enter the contact tank, which is a single cell […]

Wooler WTW (2023)

Wooler Water Treatment Works (WTW) is fed by four boreholes and supplies up to 160m3/hour of potable water to Wooler and surrounding areas, including several tourist and semi-residential holiday parks serving over 5,000 people. Seasonal fluctuation in demand can increase turbidity and increase iron and manganese concentrations in the borehole water, particularly when flows are […]

Carlisle WwTW (2022)

Carlisle WwTW lies within United Utilities’ north Cumbria region. The site is located to the north-west of Carlisle’s city centre, on the banks of the River Eden, and serves the city of Carlisle. The treatment works receives domestic sewage, trade flows, and tankered imports, providing primary and secondary treatment prior to discharge to the River […]

Rothbury STW (2022)

Rothbury Sewage Treatment Works is an unmanned Northumbrian Water site located 13 miles north-west of Morpeth, Northumberland. It is on the western valley slope of the River Coquet, a designated Site of Special Scientific Interest. The area is a popular year-round holiday destination with several caravan sites within the catchment. The original works dates from […]

Barkers Haugh STW (2021)

Barkers Haugh STW receives wastewater from a population of approximately 36,000 people. Due to a ratcheting of the Environment Agency consent in response to population growth (+4000) and a tighter total iron consent of 4mg/l an upgrade of the works was required. A total of £8m was invested to improve the quality of the effluent […]

Ludham Licence Reinvestment (2021)

Ludham WTW supplied 2.1 million litres a day (MLD) of treated water to 2,464 properties in Ludham and Martham whilst originally being fed by Ludham boreholes, with emergency supply coming from East Ruston boreholes. This £7.6m scheme addressed area growth and abstraction licence challenges by combining different schemes to deliver an efficient solution for customers […]

Bewdley Bank Service Reservoir (2020)

The Hereford Water Network is dependent on a single source of supply from the River Wye and Dŵr Cymru Welsh Water identified a need to assess the resilience of the network to maintain customer supply during any future loss of source supply events. The resulting hydraulic assessment identified the requirement to increase the available storage […]

Bryn Cowlyd WTW (2019)

Bryn Cowlyd Water Treatment Works is located south of the village of Dolgarrog in county of Conwy. The works is gravity fed with raw water from Llyn Cowlyd, 350m above and approximately three miles south west of the works, in the Carneddau mountain range in Snowdonia National Park. The old treatment works was commissioned in […]

Pegswood STW (2019)

Pegswood Sewage Treatment Works (STW) is a Northumbrian Water (NW) site located 16 miles north of Newcastle-upon-Tyne and 2 miles north-east of Morpeth, Northumberland. The treatment process comprised inlet screens, flow control and storm separation to storm tanks, two Dortmund pyramidal settlement tanks, four biological percolating filters, with a circular humus tank discharging final effluent […]

Woolston WwT Scheme - Part 4 (2019)

Woolston WwTW uses a conventional activated sludge plant (ASP), built in 1966, treating sewage flows from part of the Southampton conurbation, serving a population of approximately 62,000 people. The site occupies an area of 1.26 hectares. The existing sewerage system which feeds into the WwTW collects both wastewater and stormwater from the Woolston catchment area. […]

Cowleigh Distribution Service Reservoir & Lower Wyche Pipeline (2018)

Cowleigh Distribution Service Reservoir (DSR) and Lower Wyche DSR are located to the north and south of Great Malvern, Worcestershire and are overlooked by the Malvern Hills. Cowleigh DSR receives water from Powick Pumping Station and the Southern Strategic Main, whilst Lower Wyche DSR receives water from Bromsberrow WTW which is borehole site. Severn Trent […]

East Tanfield STW (2018)

East Tanfield Sewage Treatment Works (STW) is a Northumbrian Water Group (NWG) site located 11 miles north-west of the City of Durham and 9 miles south-west of Newcastle-upon-Tyne. It consists of two distinct sites: a ‘lower’ site comprising a terminal pumping station (TPS) with emergency storage tanks adjacent to the Houghwell Burn watercourse; and an […]

Great Dunmow Water Recycling Centre (2018)

Great Dunmow Water Recycling Centre (WRC) is located a few kilometres to the east of Stansted Airport in Essex and serves a population of approximately 10,000 people. Due to ongoing capacity limitations and operational issues in the existing works, Anglian Water elected to construct a new treatment plant on the site to serve the current […]

Hanchurch Service Reservoir (2018)

A ‘product-based’ approach to service reservoir construction is revolutionising the way MMB are constructing a new multi-million-pound distribution service reservoir (DSR) for Severn Trent Water (STW). To boost productivity in the construction process, the new 43ML reservoir is being treated as a ‘product’, manufactured largely off site in controlled-conditions, before being assembled on site near […]

Highworth WwTW (2018)

Highworth Wastewater Treatment Works (WwTW) is located at Pentylands Lane, Highworth to the northeast of Swindon. The treatment works currently serves a population of approximately 10,000 customers, with an average daily flow of 1,720m3 per day and a peak flow of 55 l/s. The works is Royal HaskoningDHV’s first full-scale Nereda plant in the UK. […]

Northcombe WTW GAC Scheme (2018)

Located near Okehampton, Northcombe WTW supplies a large region of North Devon including Barnstaple, Bideford and South Molton. The works supplies over 88,000 customers, with around half of these relying on Northcombe as their sole supply of water. As standards for water quality change, South West water (SWW) has been issued a notice by the […]

Prioress Mill Raw Water Pumping Station (2018)

Prioress Mill Raw Water Pumping station (RWPS) is located in Rhadyr, near Llancayo, Monmouthshire, on the south bank of the River Usk. It abstracts at a rate of up to 318 ML/day, and is the primary supply to Llandegfedd reservoir, which then feeds Sluvad Water Treatment Works (WTW). Prioress Mill RWPS has been identified by […]

Rivelin WTW - Sirofloc Replacement: Part 2 (2018)

Yorkshire Water Services (YWS) committed to the Drinking Water Inspectorate’s (DWI) compliance date of 31 December 2017 for beneficial completion of a new clarification process at Rivelin WTW. The £25m scheme required the design and construction of a large 82.5MLD buried treatment plant (80m long, 40m wide and 14m high) on the border of the […]

Woolston WwT Scheme - Part 3 (2018)

Built in 1966, Woolston Wastewater Treatment Works (WwTW) uses a conventional Activated Sludge Plant (ASP) to treat sewage flows from part of the Southampton conurbation. Serving a population of approximately 62,000, the site occupies an area of 1.26 hectares. The existing sewerage system which feeds into the WwTW collects both wastewater and stormwater from the […]

Flamborough Head Sewage Pumping Station (2017)

The Flamborough Head Sewage Pumping Station (SPS) is located close to a scheduled monument, a Site of Special Scientific Interest, within a local nature reserve, adjacent to a Special Area of Conservation and Special Protection Area and is home to guillemots, puffins, dolphins and porpoises. The area is also a major tourist attraction, enticing thousands […]

Gorbals Pumping Station and Drumboy Hill DSR (2017)

Scottish Water has undertaken a £120m drinking water improvement scheme in Ayrshire to meet water quality compliance objectives and provide increased resilience of supply to five operational areas. The scheme involves the transfer of water from the Milngavie WTW located north of Glasgow to the Ayrshire region southwest of the city. The scheme makes use […]

Tamar Lakes ‘Q’ Scheme (2017)

Tamar WTW was constructed in the mid 1970s and is located on the Cornwall/Devon border near Bude/Kilkhampton. Raw water is transferred to site by gravity pipework from Upper Tamer Lakes Reservoir. The works has a maximum output of 9.0 Ml/d and treated water is pumped by 2 (No.) sets of on-site high lift pumps to […]

Wicklow Wastewater Upgrade Bundle (2017)

County Wicklow is situated on the east coast of Ireland, south of Dublin. Kilcoole WwTP is located off Sea Road and the surrounding topography is agricultural farmland. The WwTP at Kilpedder is a bordered by woodlands and private dwellings, while access to Redcross WwTP is by a caravan park in Redcross. All three sites are […]

Woolston WwT Scheme - Part 2 (2017)

Built in 1966, Southern Water’s Woolston WwTW uses conventional activated sludge plant (ASP) to treat sewage flows from part of the Southampton conurbation, serving a population of approximately 62,000 people. The site occupies an area of 1.26 hectares. The existing sewerage system which feeds into the WwTW collects both wastewater and stormwater from the Woolston […]

Bryn Cowlyd WTW (2016)

Welsh Water’s Bryn Cowlyd Water Treatment Works (WTW) is located near Dolgarrog village in the Conwy Valley. The site sits on the eastern side of the Carneddau mountain range on the outskirts of Snowdonia National Park. The existing works on the site was commissioned in 1998 and can deliver up to 46Ml/d of clean water […]

Grafham WTW Resilience (2016)

Grafham WTW is located near Huntingdon and serves a population of 829,000, including Northampton, Huntingdon and Bedford. It is estimated that approximately 614,000 of these would be affected by a major outage at Grafham WTW. As part of Anglian Water’s AMP5 Final Business Plan programme, the Grafham WTW Resilience scheme was identified to mitigate the […]

Jackson’s Edge Service Reservoir - Compartment 1 (2016)

Jackson’s Edge Service Reservoir (SR) is a water supply scheme that will provide increased security to the network through the provision of a new 18Ml capacity, twin compartment SR on the site of the existing 103 year old SR. The £7.5m project has adopted a Design for Manufacture and Assembly (DfMA) approach, saving approximately £2m […]

Oswestry WTW (2016)

United Utilities’ Oswestry WTW is located near to the market town of Oswestry, Shropshire on the England/Wales border. The original works became operational in 1892, near the end of the Victorian era, in response to the growing need for wholesome clean drinking water to Liverpool. It is a large works which treats raw water from […]

Woolston WwT Scheme - Part 1 (2016)

Construction works are now in their second year on Southern Water’s £63 million environmental improvement scheme to redevelop and completely modernise Woolston WwTW. (The first year of the Woolston WwT Scheme was detailed in the 2015 edition of UK Water Projects). The existing works uses a conventional activated sludge plant (ASP), built in 1966, treating […]

Restormel WTW (2015)

GAC pesticide control and capital maintenance project

Woolston WwT Scheme (2015)

Work has started on a £63m environmental improvement scheme to redevelop and completely modernise Woolston WwTW. The existing works uses a conventional activated sludge plant (ASP), built in 1966, treating sewage flows from part of the Southampton conurbation, serving a population of approximately 62,000 people. The site occupies an area of 1.26 hectares. The existing […]

Ashford WwTW (2014)

Ashford WwTW is located approximately 15 miles north-west of Folkestone in Kent. Prior to Southern Water’s £12.6m expansion, the works served a population equivalent of 100,000 people. Starting in June 2012, this extensive project will ensure that the site continues to serve the growing population of this busy catchment, which is forecast to rise to […]

Ashford WwTW (2013)

Ashford is located approximately 15 miles north-west of Folkestone in Kent. The wastewater treatment works currently serves a population equivalent (PE) of 100,000 which is forecast to increase to 130,000 by 2020. Southern Water is investing £12.6m to upgrade and modify the process units at Ashford WwTW to meet future increases in flows and loads […]

FLI Precast Solutions construct blending chamber and PFET for Welsh Water