Lamkaddam et al. (2021) found that the Active NS product gave a reduction of ammonia emission (ranging from 17.6% to 38.3%), systematically obtained at mid fattening cycle, where the concentration of Active NS in the slurry was between 40 and 45 g m−3. The results were obtained in a one year full scale study comprising two naturally ventilated identical houses for fatteners, each wiht 18 pens. The retention of ammonium into Active NS structure caused an increase of total nitrogen in the slurry of 19.6% compared to the control barn. Christiansen (2016), found in a one month field study similar ammonia emission reduction effect, and meaured in addition 54% lower odour in the stable where Active NS was used. Earlier, AgroTech (2008) did not find either ammonia emission reduction, odour reduction or change of the homogenity of the slurry when testing addition of Siolit, which is a silicon-containing rock mineral derived from volcanic rocks (zeolite). This sugests differences between ammonia emission and odour reduction effects of various commercial IEbA's. Read more about IEbA and Active NS under ATLAS of technologies - Additives and pre/1st treatments here -