The first time I was told flushing was a myth was by a horticulturist who had nothing to do with weed and was 2 years into their micro biology degree. To put it in their words “if flushing did anything commercial greenhouses would be flushing the last 1-2 weeks of fruiting purely to reduce nutrient use and cost, but they don’t”. If buisness that are running hundreds of hectares don’t feel the need to save what could be hundreds of dollars of nutrients per run I don’t the see any need on my small scale grow.