[patall]

I think I see what you do not understand. Your freshwater is at surface pressure, not at depth pressure. You cannot just displace the salt water from your container, you need pressure to displace the saltwater and put the freshwater out of the filter chamber and in the container. That does not just happen because you cannot do it in the filter chamber as else, that filter chamber would lose its pressure differential and not work anymore. Sorry, but your idea is not made for reality :)

[mattmaroon]

The idea is a perpetual motion machine (the water of the ocean is just part of the machine) and I’m trying to show OP that. They’re just skipping an energy intensive step in their heads with every idea.