These stone bubblers are made in China like virtually all bubbling stones used in ozonators sold in the USA. We don't like these, so we're liquidating them near our cost. They're only good for ozonating water you're going to use to clean your food, or you clothing, fish tanks, etc ...not for internal use in our opinion. We conducted water tests and found these stones put impurities in the water. (this must be the worst sales pitch in the history of marketing, lol). These do not come with a warranty.
If you're going to ingest the ozonated water you create, we highly recommend you invest in the white silica (glass) bubblers. They have a lifetime warranty and do not put any impurities in your water.
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