Cooling Water

Seawater filter for Marchwood Power Station

Seawater filter from BOLLFILTER solves fishy problem at Marchwood CCGT Power Station. Marchwood Power Station is a modern CCGT (combined cycle gas turbine) Power Station. Situated on the banks of the River Test overlooking the Port of Southampton.

Seawater filter for Marchwood Power Station

Technical Specifications

Sub Application Power station cooling water seawater filter
System 3 x Bollfilter Type 6.18.2 DN200, Filtration: 500 microns
Flow 206 m3/h @ 3.5 Bar
Internals 316ti stainless steel. Rubber lined filter body. Special profile hydrodynamic filter elements.
Client Marchwood Power Station

Marchwood Power Station

The 840 Mw Station, which supplies power to approximately one million homes in the Southampton area, uses cooling water taken from the River Test estuary at a rate of some 15 tonnes a second. The raw water is also used onsite as general wash water, including for the removal of debris, such as seaweed, from the condenser bandscreens.


When the Station was built, the water cooling line was fitted with a 1.6mm duplex filtration system. However, problems soon arose with blockages to the screen nozzles and the need for daily cleaning of filter baskets caused by mussel lava and other organic matter entering the system. The spray sets and pipework to the screens were also corroded and blocked with the growing mussels.

A BOLLFILTER system was fitted with three 6.18.2 heavy duty automatic backflushing filters providing constant filtration to 500 microns, plus the original duplex filters as standby. Each automatic filter has a 3mm rubber lining and special profile filter elements with hydrodynamic backflush boost to further prevent build up of organic matter.

James Brown, Marchwood Mechanical Engineer, who was responsible for designing the pipework for the seawater filter in the new filtration system explains the advantages of the automatic filters. “When the site started operating, we soon realised the problems caused by inadequate filtration. Not only did the bandscreen spray system pipework require replacement due to corrosion, staff had to regularly leave their duties to clear nozzle blockages and clean the manual filters. The BOLLFILTERS have been brilliant, significantly cutting downtime and maintenance onsite.” Download printable Case Study.

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