A colonic which is colon irrigation or colon cleansing should be done 3 to 6 times per year to keep your colon healthy and clean.
However you don't have to have a colonic as often as that and can get 1 or even 2 colonics done each year or every few years.
However the more often you do the colonic the less chance you have of getting colon cancer and you keep your colon cleansed and it stays healthy.
You should also have a colonoscopy at age 50 and beyond every few years or so to catch any potential cancer early as possible.
Hopefully they never find colon cancer but if caught soon enough and you have colon cancer it can almost always be cured.