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Tolbest manufactures drain tracing dyes, leak tracing solutions and related products.
Founded in 1989 and based in Warrington, UK, Tolbest manufactures products used to trace liquid flows in drainage systems. Its range includes drain tracing dyes, leak tracing solutions, waste food stains and fluorescent tracking dust. The company serves construction, plumbing and environmental services clients in the UK and Europe. PHD Equity Partners acquired it on October 21, 2025.
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