While interesting is this ever going to be actually needed? Unless hydrogen is going to be used in a decentralised fashion, which seems unlikely, water can simp

While interesting is this ever going to be actually needed? Unless hydrogen is going to be used in a decentralised fashion, which seems unlikely, water can simply be saved from recombining hydrogen and oxygen. So you only ever need a finite amount of water. Plus there's also futures where harvesting salt / lithium from seawater leaves clean ish water as a by product, or a future where when it's sunny, just boil water to evaporate it with nearly free solar, then electrolyse it. And you'd need near free electricity to make this economic.