How technology is changing what happens after you flush

Let’s talk about gardening technology. Not some fancy gadget for monitoring water or sunlight, but technology that feeds the dirt itself. Washington, D.C.’s wastewater-treatment plant is one of the largest high-tech plants in the world. It uses a process akin to pressure cooking to turn what’s flushed down the toilet into fertilizer fit for planters at home. Marketplace’s Kimberly Adams takes a tour to learn more about thermal hydrolysis tech.