Blackwater to greywater

Use a helophyte filtration (constructed wetland) system, like:

• Living machine (patented by John Todd): https://www.urbangreenbluegrids.com/measures/living-machine/
• Horizontal filter: https://www.urbangreenbluegrids.com/measures/horizontal-helophyte-filter/
• Vertical: https://www.urbangreenbluegrids.com/measures/vertical-helophyte-filters/
• Vertical (aerated): https://www.urbangreenbluegrids.com/measures/aerated-vertical-helophyte-filters/

In essence, you need to let the poop and stuff go to the bottom then have the plants filter out the chemical and biological contaminants. Finally the treated water is directed off of the site (potentially into the next level of filtration). So, a three step program:

1. Feed water sedimentation
2. Biological and chemical filtration by vegetation
3. Filtered water outlet

How-to’s

https://www.instructables.com/Filter-your-Laundry-Graywater-with-Marsh-Plants/

https://www.treehugger.com/how-use-grey-water-garden-4863690

https://www.youtube.com/watch?v=uZXMOfkrZYA

https://www.doityourself.com/stry/activatecharcoal

Greywater to clean water

Clean water can generally be viewed as what we collect from collection infrastructure. However, treated greywater can be used in the same regard.

Check out the callout in previous section, the main reason for not trusting these systems is that they don’t have disinfectant stages.

1. Feed water sedimentation
2. Physical filtration (150 microns), e.g. by using sand, gravel or similar.