I purchased their HydroTumbler that is advertised to generate 5000 ppb of hydrogen. I purchased a hydrogen water test reagent and the most I got out of 5 tests was 900 PPB, the average was 800 PPB. The bottle, have to charge overnight for a full charge. Customer service, the response time is very slow, like 4 days per email on average, it's like they don't really care, or try to stretch the days till the return period lapses, overall didn't have a good experience with their customer service.