biofilmsubstance presence remarks ______________________________________control h sub 2 o sub 2 paa sds edta ma la cpc glu solution 0solution without paa 0 ppttween 20 u2122 betadine h sub 2 o sub 2 paa h sub 2 o sub 2 sds h sub 2 o sub 2 edta h sub 2 o sub 2 ma h sub 2 o sub 2 la h sub 2 o sub 2 cpc h sub 2 o sub 2 paa la h sub 2 o sub 2 paa sds h sub 2 o sub 2 ma la h sub 2 o sub 2 ma la sds 0h sub 2 o sub 2 sds edta 0h sub 2 o sub 2 paa ma sds edta sds edta ma 0 pptsds edta cpc 0 pptsds edta paa ma la ma la sds 0ma la edta pptma la sds edta 0 ppt______________________________________ ma mandelic acid la lactic acid glu glutaraldehyde peracetic acid paa solution containing all elements listed supra control tube without treatment sds sodium dodecyl sulfate cpc cetylpyridinium chloride solutions were tested directly on contaminated tubes results are expressed on a scale representing presence of a biofilm 0 no biofilm intact biofilm the solution precipitates a field test was conducted over a period of two weeks to four months to determine the cleaning and disinfecting efficacy of the compositions of the present invention the composition was fed to the network of small diameter fresh water lines of a dentist 39 s installation for comparative purposes at the end of each work day all the small diameter water pipes of the dentist 39 s installation.