The invention relates to a tester apparatus of the kind including a portable supporting structure for removably holding and testing a substrate carrying a microelectronic circuit. A drive shaft includes a generally tapered surface and rotatably drives the rotating disks to increase the energy of a fluid stream disposed within the housing. A geo-textile liner is optionally positioned inside of the filter basket. The functional elements can be selectively arranged as needed to configure the compartment as a handicapped accessible toilet compartment, a childcare or medical care room, an office work compartment, a detention cell, a smokers’ compartment, etc. The second portion includes a male mating section and a shaft mounting section. The present invention provides methods useful for treating or preventing biofilm formation and microbial infections associated with biofilm formation by using an agent that either increases LuxS-dependent pathway or interspecies quorum sensing signal.