Premixed synthetics like the QF can be stored at room temp for up to two years. Human urine needs to be refrigerated or frozen if not being used right away.

The QF is not biohazardous. Human urine is and thus requires more careful handling.

The QF is a drug-free urine substitute. If you use human urine, you have to be sure that the sub donor is completely drug-free (including scripted and OTC meds) and had not consumed large amounts of fluids prior to donating the sample to you.