But even with dirty water it is possible to build low(ish) budget, long lasting filters from widely available components. I plan on giving this a try at some point, supposedly these can run for years with no power requirements too and no need for hard to source filters. https://www.youtube.com/watch?v=aMoT4ssiYtY&pp=ygUZcGVybWFjdWx0dXJlIHdhdGVyIGZpbHRlcg%3D%3D