1500 cc, which many commercial bags and buckets sold for cleansing enemas are considered a real enemas, that's 1.58 quarts. For me that's just not enough..For me a real enema is two quarts, and the clear barium enema bags are 2500 cc, which is what I use frequently and that's 2.6 U.S. quarts, which is just right for me. (2.2 imperial quarts)3 Quarts is now a bit much for me and I only got to the U.S. gallon mark a few times in my 20's and 30's. I'm a quality not quantity person.Most I've ever seen any of my playmates take was 2 - 2500cc bags then another 500cc, or a total of 5500cc or 5.8 quarts! That was at an e-fest contest in Las Vegas in 2000, she didn't do near as well the next years. She was beaten, however, by a rather large (grossly obese) gentleman who managed about 6500cc or 6.8 quarts.My first gallon was during a visit to Mildred P. Burgess in Boston. I was well cleaned out and having my final colon tube enema, I was filled with a 2 quart bag, and asked if I could take more, I felt that I could, so mildred, using a pitcher filled the bag again, I got most of it in and said that was enough. She suggested I wait a bit and try to take more, things calmed down and the last 1/2 pint or so went in easily. That was so good under those circumstances. Only problem, for the rest of the day I was urinating frequently and copiously. This was one of the days of my life if I could live over I would.Years later, at Grand Dames in Los Angeles Valarie was keen to get a gallon into me, but never quite succeeded, I was in my late 40's at the time.