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In 2019 South West Water joined other water companies by employing new options to improve water quality whilst reducing both CAPEX and OPEX. The newest order was the 2nd for South West Water.

Recently the Institute of Water’s South West Area Innovation Award Competition judges singled out the use of the ResMix ‘Source Management’ Systems at South West Water. The independent judges, drawn from Academic, Water Company and Supply Chain commented: “Interesting to see the combination of two proven technologies that are now of a suitably industrial scale to use in a drinking water reservoir to overcome issues around stratification and turnover of the water column and removing algae.”

In 2019 South West Water installed their first ResMix ‘Source Management System’ at Wistlandpound reservoir (pictured above and below right). Within 90 days of installation, South West Water reported improvements to the Wistlandpound reservoir including a reduction in algae.

In March of 2023, Gurney Environmental completed the installation for South West Water of a 2nd ResMix 3000 ‘Source Management’ System at their Meldon Reservoir, this unit with the optional TYTAN® Algae Management System. The ResMix 3000 unit at Wistlandpound replaced a previous compressed air system for BGA control. The newest installation at Meldon was the 2nd ResMix system installed for SWW. The new ResMix 3000 units are able to reduce energy requirements by almost 90%!

Chris Rockey, head of water quality for SWW, with original ResMix being towed into position behind him. Rockey said: “The ResMix is an innovative replacement of the system used previously and will provide better mixing more efficiently while using less energy due to its ingenious design.”

Read about the previous South West Water ResMix 3000 system installed at SWW’s Wistlandpound Reservoir.

Raw Water Pretreatment

Cost effective, simple to install and with very low energy consumption (<10% of a compressed air system), ResMix provides sustainable, year-round ‘Source Management’ for the first time. The optional TYTAN® Algae Management System attaches directly to the ResMix unit to provide an increased pro-active positive algae management that treats the water as it is constantly drawn into the area surrounding the ResMix unit with a 500m area of influence.

The largest system, the ResMix 5000cc, consists of two counter rotating, surface-mounted, large axial flow mixers. The units can transfer 20 tonnes of oxygenated water from the surface to the bottom of a reservoir every second, not only eliminating thermal stratification but also increasing net dissolved oxygen levels throughout the water column. The ResMix 3000 is a smaller version of the 5000cc.

Learn more about the ResMix Source Management Systems on our website.

Meldon Reservoir

Meldon Reservoir is a reservoir in Devon, England owned by South West Water. Over the course of the 19th and 20th centuries, several reservoirs and dams were built in the area now covered by Dartmoor National Park in Devon, England to supply drinking water to the rapidly growing towns in the surrounding lowlands. With its deep valleys and high rainfall, Dartmoor was an inevitable location. New reservoirs continued construction even after the establishment of the National Park in 1951.

Installation at South West Water's Meldon Reservoir


Meldon Install 6 graded v2

Meldon Install 7 graded v2


Meldon Install 8 graded v2

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Excellence & Awards

  • Net Zero Carbon Initiative Finalist
    Stantec & Yorkshire Water Finalists in 2023 Water Industry Awards for the Withernsea Aero-Fac® WwTP

  • ICE Award
    The Withernsea Aero-Fac® WwTP has won the 2023 Institution of Civil Engineering's Edmund Hambly Medal (Design for sustainable development).

  • Green 100
    Gurney Environmental has been named a Green 100 company for Norfolk and Suffolk, England.

  • Certificate of Accreditation
    Gurney Environmental has been awarded a certificate of accreditation within the Contractors Health and Safety Assessment Scheme (CHAS) having demonstrated compliance with and sound management of current basic health and safety legislation.

  • Business Award
    Gurney Environmental were awarded a finalists place in Eastern Daily News Business Awards 17, a UK regional newspaper's business awards event.

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