After writing a post on the fascinating new PPlanter, one of their designers, Julia Schmitt, was kind enough to write in and provide some key details.
Hey there, I’m one of the PPlanter designers. To answer your question about how it works – there is a 5-layer filtration system built into the center module (where the urinal and sink are located) to help capture excess nutrients, pollutants, and salts prior to urine/sink-greywater being pumped into the bamboo planters. Indeed, you’re right – we could use the center urinal module with ANY nutrient/salt-tolerant plants. That’s part of what makes the system modular/reconfigurable as we describe it. For multiple urinal units, we could bring out 10+ bamboo planters, or just locate the urinal adjacent to a large garden, farm, or compost pile as long as there are plants that are nutrient/salt tolerant.
We like to point out that this project will initially be intended for festivals and food-truck confluences. Down the line, once we’ve gotten enough funding, fixed any bugs that exist, and made it more rugged, we could deploy it on streets for more permanent use by anyone and everyone.