This study examined the profitability of zeolite, a clay used as a feed additive, for improving the feed conversion rate, carcass quality and intestinal absorption of N, P, K and S by grower-finisher pigs, while reducing the release of these nutrients in the environment and that of odours and gases in the barn. The results show that zeolite did not have an important impact on feed conversion, average daily gain and carcass quality. However, adding zeolite to the diet reduced odours emissions by up to 45% and reduced the volume of slurry by up to 18%. Moreover, zeolite showed some potential in reducing nitrogen and phosphorous in the slurry. The searchers also observed that zeolite remains stable in the pig’s stomach and that very few heavy metals are released, when energy and protein levels are well adjusted. Parallely, the searchers have determined a few handling recommendations. Firstly, one should request from the zeolite supplier a proof that this clay steadily contains at least 75% clinoptilolite (a type of zeolite). Secondly, the granulometry of the zeolite must stand between 0,25mm and 0,50mm: finer particles hinders absorption and coarser particles have a reduced impact on palatability. Moreover, the rough surface offered by particles of ground clinoptilolite could necessitate vibration during handling (like at the outlet of a conical silo). At the mine, clinoptilolite must be handled under dry conditions: if exposed to moisture, it readily agglomerates. Further research is required before receiving the certification of the Canadian food inspection agency.