Forgot that you asked about senna tea also. I wouldn't try to replace the epson salts with it. It does help clean out the pipes but it would place additional stress on the liver since it would place additional compounds in the bloodstream which would then be processed by the liver. Save it for the day after if you feel that you need additional bowel flushing. I used it mostly for The Master Cleanse so I could back off on the morning saltwater flush. A good one for me is Smooth Move Tea. Beware tho' - if you aren't an early riser you will be.