This doesn't really seem that compelling. I don't believe that in the real world a system like this can produce drinkable water without at least pre-filters tha

This doesn't really seem that compelling. I don't believe that in the real world a system like this can produce drinkable water without at least pre-filters that require maintenance. And unless I'm misinformed, the cost and availability of replacement RO membranes isn't what's limiting the use of RO desalination or water purification where it's needed.