My first block was defective. YouYah support responded very quickly and sent me a replacement device within a few days. I tested the replacement unit with a water tester and it works as advertised. As YouYah recommends, I also treated my tap water for 3-4 cycles prior to testing. I measured an H2 level of 1.3ppm and an ORP of -600mV. Before treatment, H2 was 0ppm and OPR was +600mV!
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