Why don’t we pipe seawater into our homes and then split it into combustible Hydrogen and Oxygen w/solar power

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Question by BD: Why don’t we pipe seawater into our homes and then split it into combustible Hydrogen and Oxygen w/solar power
My understanding is that salt water is fairly easily converted into its combustible gas components (or even better “Brown’s” gas I think it’s called) with a little current and a particular kind of metal. Since there is obviously a huge abundance of salt water on the planet, why aren’t we using it to generate combustible fuel, which satisfies all of our home needs, on site in the home? We could run our heat, AC, hot water, stoves and ovens, dryers and refrigerators with it and we could power a generator for our electricity needs.
What’s the holdup to this clean, viable, cheap energy source aside from oil monopolies suppressing this technology?

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