If you want technical. Colema was the first to come out with the particle board that is laminated, including the folding board. The also created the name "Colema" the real name for these boards is colenema. So a Colema is not a catagory of units created for home use, it is in particular the Colema board of California.
Colema was the first with the particle boards, but the first deluxe blue one piece board on the market was the Ultimate Trends board. They held the first paten on the deluxe type and originally it was white. The maker was good friends with Dr. Bernard Jensen
. Dr jensen recommened that he change the board to the blue that it is because of the soothing and healing effect of the color. This is the board that has been copied by everyone else. Colema came out with a delux blue board only after the Ultimate Trends paten had expired.
I purchased the Ultimate colon cleansing board. Their unit comes with a plumbed solution container so that you do not have to siphon, like you do with Colema Boards. They have never sold a stainless steel tip, because they say that most of the people that use the home units are not necessarilly familiar with the turns that the colon takes. Inserting a hard steel tip could lead to poking a hole in the colon wall. The only sell a flexible tip, that can be sterilized and used over and over by the same person. I have seen them on E-bay. Use colonic
as a search term on E-bay.