Predicted mass-loss rates. We show galaxies in SPRITZ well detected with PRIMAger in a 10 sq. deg. survey with 150 hours of integration per square degree for the redshift range 1.5 < z < 2, using an extrapolation of the relation described in Sect. 3.5. The red galaxies (about 200 of them) are brighter than 120 mJy at 210 μm, and thus can be followed up in velocity-resolved OH absorption spectroscopy in a moderate integration. These are very rapidly growing systems expected to host massive winds.