I think an enema makes all the difference in the world and a warm- water enema is one of the best, because you have lots of water to work with. I am not familiar with the kit you are describing, but I think it probably resembles a light plastic hand-held liquid bubble-insert, which I don't think is enough to get what you need OUT completely. I would invest in the walgreens enema at $11, if you can find it. And yes, some of the best results and feeling is achieved after this enema is complete.
Some people use some coffee in their warm water, as that chemical further stimulates the liver, to get the toxicity flushed out. I hope this helps you :)