The present invention includes a composition for photoablation comprising a photosensitizer and ethylenediaminetetraacetic acid (“EDTA”) at a very low concentration (e.g., ranging from about 0.01 mM to about 1.25 mM), wherein the composition is used for photoablation of at least one targeted organism. The present invention also includes a method for photoablation comprising applying the composition to a treatment site containing at least one targeted organism and applying light to the treatment site at a wavelength absorbed by the photosensitizer so as to inhibit the at least one targeted organism.
