Polyurethane-imide membranes and their use for the separation of

Polyvinylidene fluoride membrane and method for removing viruses

Pond filter with filter member and nozzle

Pool and spa filter media

Pool buffering composition and method of use

Pool cleaning and sanitizing apparatus

Pool cleaning and sanitizing apparatus

Pool cleaning method and apparatus

Pool filter with electrolytic action

Pool pump filter

Pool saver

Pool skimmer basket assembly and method

Pool skimmer screens

Pool skimming device

Pool vacuum prefiltering method, utilizing centrifugal force

Pore size control using plasma polymerization techniques

Porous ferro- or ferrimagnetic glass particles for isolating...

Porous fibers and membranes and methods for their preparation an

Porous filter media and membrane support means

Porous hollow fiber membrane and a method for the removal of a v