dr schulze says that over time your body should become strong enough with his formula to go on its own. so basically he says it takes time.
also he says he would rather be addicted to an effective laxtive than to be constipated. worst case scenario you take it for the rest of your life but are never constipated.
cascara is not a habit forming laxative and actually requires bacteria in the bowel to activate it. it can be taken without any fear of addiction. using it with probiotics would be best.
a good formula for toning the colon without addiction is dr christopher's lower bowel tonic. it does not contain senna(the addictive herb). its mild but over time should build a strong bowel without dependance.
dr schulze also said that in order to not be constipated the diet must be changed to high fiber plant based. and the lifestyle must be changed to active to get the exercise that stimulates normal peristalsis(jumping, running, hiking).
i would use dr schulzes formula for a thorough cleansing and then switch to the christopher formula for long term toning. hope this helps.