Thanks a lot uys, but could you clear these concerns:
"Now, I am planning to do another flush asap. My question is how would I know if the stones blocking the duct get out after the planned flush? Does passing any stones mean that the duct got open? or I can pass stones yet the some stones remain in the duct?"
Also, when do you consider yourself stone free? I read that some people don't get stones on some flushes but they do later? so how do you know you are done?