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CHECKPOINT/RNZ A Covid-19 wastewater testing pilot s being rolled out around the country as a safety net for catching the virus in the community. How is wastewater sampled? Every day, about 400 million litres of wastewater are collected and treated in Auckland, across 7999 kilometres of wastewater pipes, 518 wastewater stations, 18 treatment plants and 167,264 maintenance holes. Wastewater testing is not new – ESR routinely tests wastewater for viruses and illicit drugs, such as MDMA and cocaine. There are two ways to take wastewater samples, says Dr Joanne Hewitt, head of ESR s environmental virology laboratory: automatic composite samples and grab samples. Automatic composite sampling – where a pump automatically collects a small volume of wastewater every 15 minutes over 24 hours – is the preferred method.

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