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The filter block assets at Langham WTW, some of which dated back to 1931 when it was constructed, were showing their age and in need of investment. Some investment was already yielding tangible benefits through the greatly improved performance of the backwashing process and the works as a whole.

In 2013, a contract was awarded to IWS, following a competitive bid process, to undertake the remaining upgrade works.

This in brief, consisted of a complete refurbishment of filter 5 (which had been out of service for some years following a catastrophic failure of the under drains), new backwash pumps, new MCCs and ICA panel, new actuated outlet valves, backwash valves and additional launders fitted in the external filter shells.

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