- Porvair said there will not be a recurrence in 2015 of the unusually high revenues recognised from several large projects in 2014. Total revenues are therefore 4% lower than the prior year, just ahead of management expectation.

"Porvair has made a good start to 2015 with underlying revenue 6% ahead of the same period in the prior year," the company said.

Underlying revenue in Microfiltration was 7% ahead of the prior year and new facilities in New Milton, UK and Caribou, Maine have been completed on time and budget and brought on stream to accommodate growth.

The large projects continue to progress well. Metals Filtration's revenue was 5% ahead of the prior year (3% lower in constant currency). Expansion in Wuhan, China is underway.

"The outlook is encouraging with orders books remaining strong."

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