I am using about 1/4 cup of vinegar to 2 quarts of water (sorry, I don't know how that converts, exactly, but I think two quarts is close to two liters). Sometimes I put in 1/2 cup of vinegar to 2 quarts of water. Most times I can only take about 1/3 of this mixture before having to expell (which happens with quite a lot of force). What I've been doing is one or two series of the vinegar enemas, then a plain water enema (which is very soothing), then another series of vinegar. I've been doing this once a day for four days, now. The last two days, I ended with a coffee enema (1 cup measure).