Usually distilled - but the best is look up the manufacturers recommendation for the particular model.

Great question! It differs for each person & depends if you eat the SAD diet (Standard American Diet) or a healthy diet with minimum processed food, & how often you have a bowel movement. According to preventive MD's, they recommend having 2-3 bowel movements per day. I have alot of this info on my website under "What Doctors Say". I was raised with a very healthy diet & I have personally been doing 2 colon cleanses (7-8 days long) per year since I was 17. I am now 45 & I have NO health problems at all. I personally don't recommend colon cleansing products with harsh herbs like senna. I work with many constipated people & it is not necessary. I recommend working with a colon therapist at least for your first cleanse. You will learn alot. Also, I recommend the Vitratox cleansing products, They are high quality products & truly the best. I've tried many & have found the one I grew up with (Vitratox) is the most effective.

www.watersoflifecleansing.com