I've used Colonix on and off for 3 years. For me, works as advertised, mostly never had a problem. Never paid too much attention to Oxypowder , but I'll take a look at it.
However, the point I was trying to make was about epson salts or any laxative, just my perception, was that it will just rinse you out, but not get you "Spic and Span" clean, getting out the plaque.
Never heard anyone say anything against taking a fiber supplement everyday. Laxatives are a different story.