after the unfreezing the sample was inconsistent and by that I mean there was some heavy matter (not quite fully liquid looking, but not solid either) floating at the bottom. So, I shook it up and that evened it all out, but after shaking I did notice visible particles that resembled small flakes of fish food floating.
Any "floaties" that you see can be filtered out, using either a coffee filter or a section of nylon stocking. If youre concerned whether or not any of the urine constituents had been affected, you can always test the urine sub with a validity test kit. These kits are inexpensive and are found online by doing a Google search for "drug adulteration test kits"