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.