I found this article today about a filter-free and no-moving-parts water filtration system that relies on CO2 injection to ionize the water and encourage the non-water particles to separate from the water. It seemed worth sharing.
There are a number of natural processes that produce CO2 (biogas production, for instance). If this pans out, it's worth designing the output of a biogas upgrading process to feed the input of a water purification process.
Ever since I found this suit I've felt strange new needs. And a tiny ad: