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Could you please tell me what to do about a slight water leak: how to detect this leak by not digging the entire distance between the meter of our house (which dates from the 60s-70s) Is there any a device or method? This not to sack our garden by a long trench...

Detecting a water leak, especially limited on a buried network is not easy. If this network is located under a lawn, the water leak zone, especially in summer, may be marked by a greener area and grass growing faster.
There are specific professional techniques such as endoscopic control, infrared thermography, video diagnosis or floor listening. The latter is the most used. It consists of listening to the ground with a specific device that detects the noises (even very weak) characteristics of a leak on a pipe (for example Aquaphon A 100). Specialized companies can make this diagnosis.

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