The green putty sounds like a mixture of recently released bile and fecal material. Youprobably released a lot of toxins even if you did not see stones. One of the reasons not to skimp on the Epsom Salts is that when a lot of magnesium is taken orally the excess is absorbed into the intestines where it draws in water so the magnesium can be excreated. If Epsom Salt does bother you substitute a bottle of magnesium citrate for your first ES drink. The second drink needs to be Epsom Salt because it helps relax the biliary ducts and makes it easier to pass stones.