Based on Charles Havelock Taylor's Hydraulic Air Compressor

And looks like this Ai mockup.

It's a pool that powers your home, heats and cools it and provides potable drinking water for your family. Everything is done silently under the water.

It's a pool. it's a power plant. 

It's a grid battery.

Patent Pending 

Adding air to water is like weaving a new cloth — the magic lies in how it transforms into electricity, compressed air, energy storage, heating, cooling, potable water, and recreation. A different world, far beyond “just hydro.”

Beyond Wind, Beyond Solar, Beyond Nuclear, Beyond Coal.