Near our house, there’s a water treatment plant. It receives sewage water from all over the city. Today, I decided to stop by to see what those bags near the entrance were about. It turns out, they’re giving away free fertilizer, bio sludge. Essentially, it’s a by-product of the sewage water treatment process, and, apparently due to its by-product nature and relatively small quantities (and clearly the impossibility of scaling these volumes), they’re distributed for free. If you consider buying such fertilizer, there is a sign that suggests taking no more than 5 bags if possible. However, critics point out a slight potential toxicity of these fertilizers – apparently, they contain a slight exceedance of PFAS (polyfluoroalkyl sulfonates – chemical compounds also known as “forever chemicals” due to their durability and resistance to decomposition in the environment). But on the other hand, for fertilizing lawns, this isn’t really an issue, even if it exists.
Hi, I'm Rauf Aliev. 