By popular demand of one i will start this off, waste water management from India using a natural occurring soil composite that reduces hard metals and shit apparently.
[URL="http://www.wastewatertreatment.co.in/pdf/Treatment-of-municipal-wastewater-using-laterite-based-constructed-soil-filter.pdf[/URL]
I would love to know if someone can translate the diagram to a cost of making it looks like 2 pumps, and piping plus the laterite block.
suggestions?