Sounds like you're doing them just fine. Not all of us have mucus, some body types aren't prone to it. It's mosty caused by mixing alcohol, dairy, red meat and fruit all in the same meal, things like that.
If the water comes out all at once, rather than taking awhile to all get out of your system (I have butt pee about half an hour after putting the enema stuff away) then that would indicate that the water is staying in th descending colon and not making its way to the transverse or ascending colon.
You can help the water go UP the colon with gravity and massage. Lift your buttocks off the ground for awhile, then turn on your right side, and all the time keep pressing down on the colon moving counter-clockwise or UP your colon.