Could China be bypassing the centralised potable water treatment paradigm and skipping straight to POU?
I recently attended Aquatech China in Shanghai, the biggest water technology trade show in China. There were hundreds of Chinese membrane manufactures present, with both high-pressure and low-pressure membrane solutions. Most were targeting the domestic market, and it was clear that the government endorsed strategy to grow a domestic membrane industry is working.
More interestingly though, at least half, and perhaps two thirds of the exhibitors were selling point-of-use products. Over the years I have heard many people argue that it is ridiculous to send potable quality water through the network for all household use, when only a tiny fraction of the water consumed is actually for human consumption. Third-pipe systems are an alternative, but require costly duplication of infrastructure.
The alternative is to send partially treated water down the network and have consumers treat their own water at point-of-use. This idea is an anathema to those steeped in the John Snow school of taking control away from the consumer for their own good, and seems unlikely to get anywhere in developed countries.
In China however, where the availability of high quality potable water out of the tap is far from universal, but a relatively wealthy and educated middle-class is growing rapidly, demand for high quality potable water is resulting in a high demand for point-of-use treatment solutions.
I wonder if the bulk of China’s cities may bypass the John Snow paradigm and move straight to consumer control of their own water quality.