how often to do enemas when bowel cleansing

im doing a p&b bowel cleanse.how often can you do the enemas.last time i did the p&b i got backed up but wasnt doing any enemas.i wouldnt want that to happen again.also should i do probiotic enemas and what about mineral supplements.id like to do the bowel clease for 2 weeks and then a liver cleanse does that sound about right amount of time for the bowels.any help would be greatly appreciated.thanx Tweet