Sorry, misspelled POLYFILTER polybiomarine makes it I have used them for years , they are a propreity pads since the seventies that adsord and absorb organics, Po4, insectisides and etc, high end filter pads used in labs and by myself and both marine and freshwater Aquarists that change color and can possibly show based on the pad color what is being adsorded like iron, copper ammonia etc, tell the boyfriend not to ever use ammonia products around aquariums. Hopefully this will help you.