Products from twenty-two companies that are designed to control odors and reduce solids in liquid swine manure were tested in addition to treatments done with : waste oil, activated charcoal, wintergreen oil, chlorine, mecanical aeration and an experimental product formulated at UIUC laboratories. A large panel of 40 to 50 persons were asked to rate odor on a 0-10 scale for odor strenght and also for acceptability (parfume being high for strenght and low for acceptability). The samples were put in black bottles covered with a gauze to be rated by panel members. The results showed a large variability in the results. No fatigue of the panel members was observed as the clean water was always correctly identify and rated. The aeration treatment seemed to present the best performances in odor control however no significant differences could be measured between the different products and treatments. No differences were also observed for solids reduction.