I took a look at the unit that you are thinking of buying. You have to sit up to do the cleanse. I just do not see how this will allow the solution to easily cleanse the whole large intestine. Its a matter of gravity. That coupled with the fact that it is is only 2 1/2 gallons makes it seem to me that it would not be very effective. Plus they indicate that the tips should not go more than 3 inches into the rectum. How do you keep it from going in to far when you have to sit on it?
I personally use the unit by Ultimate. They are the first ones to produce and paten the blue deluxe one piece units you see on the market today. The unit comes with a fully plumbed 5 gallon solution container, so you just flick a clamp and the solution flows. No siphoning. They are also the only company that I found that offers a 30 day money back guarantee on the board itself. And a lifetime replacement guarantee if the board should ever break during normal usage. You said the unit you are looking at runs $120.00. Ultimate's unit is a little more then that, I think about $115.00 more delivered. Oh and they also offer a neat little product called the EZ fill. It snaps easily onto your faucet, filters the water and sends it up to your solution container. http://www.myhomecolonic.com
is their web address. I think they still sell on ebay also under "colonic".
When I cleanse I don't stop at 5 gallons, I prefer 7 to 10 gallons. If I stop at 5, I find that I have to run back to the toilet several times after. Plus if you have a colonic done on a professional system, they tend to use quite a bit more than 5 gallons.
Well what ever you choose, I wish you luck.