Here are some Instructables on how to pump and/or filter water. I need to know this for the houseboat.
For the record, this list is more for me being able to not have to search through 700+ Favorites to find the specific project I'm looking for. As I cull through my Favorites, this list will grow. Once I've gone through all of the Favorites, I'll start paring these lists down by finding the best of the various similar projects.
Hopefully, though not the original intention, these lists can help other people who have gone searching for Instructables and gotten lost in the maze.