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Entech Design is known for EchoSmart, a line of high quality sludge level monitors for wastewater, drinking water and industrial clarifiers and thickeners. Entech's FilterSmart Backwash Monitor is revolutionizing the way water professionals manage their gravity filters. As a pioneer in the field of underwater ultrasonics, Entech has led the way since 1991. Underwater interface level detection is our only business, and we do it right!