Yes 2 liters is a little over 2 US quarts. 2 liters should be enough to cleanse you thoroughly but it also depends on your size and the condition of your bowels. What kind of solution are you using? I find that plain water is often not sufficient and resort to either soapsuds or baking soda.
The preferred way is to take a series enema. First take ½ to 3/4 liter, retain and then expel. Then take a second enema and increase the volume say to 1 ½ liters, retain and expel. Then take a third enema of 2 liters, retain and expel. I have taken five enemas when doing a very complete cleanse.
First you will have much less pain. Second you get a better cleanse as each enema clears the way for the next enema. Granted that this take more time but its well worth it.
I hope that I have answered your questions otherwise write again and I will try to answer once more.
Everything seems fine with your health until I came upon the last sentence of your message; you said “Mine just seemed to be undigested food that I had eaten the previous day.”.
It takes, for the average person, 8 hours from masticating (chewing) food, going though the esophagus into stomach and from there into the small intestines and thence exiting into the bowels. Most of the digesting is done by then, so if you have undigested food from the previous day, could it be that you are not digesting your food and therefor not getting any nourishment.
If you feel that this is the case, then we need to look into your digestive track and find out why you have a weak digestion.