Go for it...
Reverse Osmosis is a purification process. Reverse Osmosis purified water is second only to distilled water. I've had some excellent results from colonics, but others on this site have not, (check mine and others previous posts). Just make surer you check it all out ahead of time and know exactly what you're getting and exactly what to expect. The water question sounds like you're doing your home work. When you're ready, relax and let the water flow.
Good health to you