Available in five colours — green, yellow, orange, blue, and red — Wardsflex Drain Tracing Dye is a non-toxic powder used to trace the flow and direction of drains and sewers. Simply dissolve 3–4g in cold water and introduce it to the drain or ground where contamination is suspected. Each 200g jar will colour up to 15,000–20,000 litres of chemical-free water, making it a cost-effective solution for drainage investigation and leak detection.