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The rods in my hot water tank were separating the hydrogen and oxygen. Called electrolysis

Powered water heater anodes are now a thing. Supposedly they can make your water heater last almost indefinitely and get rid of any bad smells from sulfur in the water.

Perhaps just a little dangerous if you've got fracking contamination?

https://www.corroprotec.com/

I have installed one of these before in a domestic hot water tank exposed to unfavorable water supply (well, midwest aquifer), and they do what is on the tin. Also, working with their customer support department (Québec) is an experience (both positive and unvarnished), highly recommend.

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