Abstract: Disclosed herein are indwelling medical devices suitable for introduction into the body of a subject, wherein the indwelling medical devices comprise one or more surfaces on which a bacterial biofilm can form, and an effective amount of a bacteriophage composition carried by one or more of the surfaces, wherein the bacteriophage composition inhibits formation of the bacterial biofilm on the indwelling medical device. Also disclosed herein are methods of inhibiting the formation of bacterial biofilms on indwelling medical devices.

Abstract: A method for reducing formation of deposits on a surface in contact with an aqueous system includes applying to the surface a composition comprising a polyoxypropylene-polyoxyethylene block copolymer and a biocide. The composition optionally may also include a dispersant.

Abstract: A method for inhibiting microbial colonization of a surface in contact with an aqueous system is disclosed, which comprises adding to the system an amount of at least one compound including repeating ethylene oxide units.

Abstract: A method for controlling zebra mussels in aqueous systems comprising treating aqueous systems which contain zebra mussels or which are prone to zebra mussel infestation with an effective amount of a composition comprising a) a water-soluble dialkyl diallyl quaternary ammonium polymer (polyquat); and b) didecyl dimethyl ammonium halide. A preferred polymer is a poly(quaternary ammonium) compound having the recurring structure [DMDAAX.sup.- ] resulting from the polymerization of monomeric dimethyl diallyl ammonium X.sup.-, wherein X.sup.- is any suitable anion.

Abstract: A method for controlling zebra mussels in aqueous systems comprising treating aqueous systems which contain zebra mussels or which are prone to zebra mussel infestation with an effective amount of a didecyl demethyl ammonium halide.

Abstract: A method for controlling zebra mussels in aqueous systems comprising treating aqueous systems which contain zebra mussels or which are prone to zebra mussel infestation with an effective amount of a water-soluble dialkyl diallyl quaternary ammonium polymer (polyquat). A preferred polymer is a poly(quaternary ammonium) compound having the recurring structure [DMDAAX.sup.- ] resulting from the polymerization of monomeric dimethyl diallyl ammonium X.sup.-, wherein X.sup.- is any suitable anion.

Abstract: A probe rod is inserted into a water main through a corporation cock. The rod has a plurality of transverse passages parallel to one another and aligned in the direction of flow. Within these transverse passages, in flush relationship to the passage walls, are inserted removable sampling rings. All but one of the rings are of the same material as the inner wall of the main. The remaining ring, used as a control, is a synthetic resin ring. The flush relationship prevents the formation of turbulent eddies at the ends of the rings. Consequently, microbial growth conditions on the rings themselves reliably simulate conditions on the interior wall of the main.Within a tubular extension on the exterior of the corporation cock an O-ring seal is provided. The length of the extension, and the position of the seal, are such that the probe rod can be partially withdrawn beyond the corporation valve without causing any of the transverse passages to pass through the O-ring.