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There is a product called quick fix, and if your not being watched up close and personal it works every time, It is synthetic urine, has all the minerals and ph of urine ... Voir Plus
the long time keep the urin sample the happen Bacteria Growth
sa a bacterial growing, ph of urine become more acidic
IT WILL BECOME TURBID WHICH RENDER UNEFFECTIVE FOR BIOCHEMICAL TEST
It won't be reliable for culture or other chemical test PH will decrease