It is recommended that before a full-scale application of a treatment or treatment system, an onsite performance test be run incorporating site conditions of water temperature and chemistry and other local conditions. These factors will affect molluscicide performance (Allen 1994).
Optimal timing and efficacy of chemical control treatments can be determined using biobox monitors set up in various configurations to test presence or settlement of veligers. These are chambers connected to a side stream of the water system that allow sampling of incoming veligers or determination of toxicity to adults preseeded into the boxes. Molluscicides can be injected into the water supply at a point midway between two side-stream monitors at preestablished time intervals to evaluate treatment efficacy (Claudi and Mackie 1994; Green 1995). Data collected before, during, and after application will show effect of treatment.