You can flush every day or every second day, as long at it makes you feel good.
Few people tried flushing up to 5 times a week, and up to 15 times per month, the problem they were trying to fix was Multiple Chemical Sensitivity, the worse case of multiple allergies and intolerances.
In case you choose to flush more often, you will need to wash your bowel with enema/colonics after every flush( and if you have time, you shoulød also do it before every flush), and you will need to cut amount of Epsom salt, if the standard amount makes you feel dehydrated.