Chloride reduced polyethylenimine antipathogen film apparatus and method of use thereof

A method for forming a biocidal film, comprising the steps of:

• reacting a homopolymer with a strong acid to form a solution comprising a polyalkylenimine in a linear partially protonated state, free chloride ions, and chloride counterions associated with protonated sites of said polyalkylenimine;
• removing a first at least fifty percent of said free chloride ions from said solution via a density separation process to yield a residual chloride concentration;
• reducing a water concentration of said solution by at least ten percent;
• reducing said residual chloride concentration by a second at least fifty percent with an anion exchange material;
• decreasing a percentage of protonated sites of said polyalkylenimine associated with said chloride counterions through addition of an organic acid to said solution, a conjugate base of said organic acid comprising new counterions to newly formed charged sites on said polyalkylenimine;
• and
• forming, from said solution, said biocidal film with a film property of:
• inactivating at least 99 and less than 99.9990 percent of a first bacteria making contact with said biocidal film within 10 minutes;
• and
• deactivating at least 99 percent of second bacteria within one hour, said second bacteria contacting said biocidal film at least one day after the first bacteria contacted said biocidal film.