This picture shows the insight of the storage chamber in the MAP reactor where the treated urine is stored before the pump (cylindrical form in the middle) is pumping it into the sewer. Most of the phosphor (about 95%) is extracted before. Here, the chamber is not cleaned from leftovers of struvite and other precipitates. You can see the wet struvite at the bottom. (Photo: Katharina Löw, February 2011)