Review (2/5): Optiphen Plus - NOT Germall Plus
Optiphen is pretty good as a preservative and similar to Germall, but they are not the same. If I order Germall, I want Germall. Do a little research online. They are mostly interchangeable, but there are slight differences in the suggested ph range, max temp, and max usage.
Germall ingredients: Propylene Glycol, Diazolidinyl Urea, Iodopropynyl Butylcarbamate
Optiphen ingredients: Phenoxyethanol, Caprylyl Glycol