All-purpose fixative; buffered with sodium phosphate to preserve morphological characteristics - 5% concentration: recommended for protozoan cysts - 10% concentration: recommended for helminth eggs and larvae - When the stool specimen is added to the vial, the final ratio of stool to preservative is 1:3 - Preserved stool can be concentrated using Formalin-Ether/Ethyl Acetate Concentration Technique (FECT/FEACT)