I am really the wrong person to ask. Since i have used every supplement mentioned on this forum before, since I have a calcified stone. If you have chanca piedra, it is highly recommended, try it. I tried it for several months every year for a calcified stone, it never changed. On the other hand you don't know what kind of stone it is.
Most people that are here never had an ultrasound so most of them don't even know if they have calcified stones. And I would guess they don't have any or they are very small and just come out with the flush.
Read the history of Telman's flushes at top of page. how many stones he is getting out.
Also the word "stone" is confusing, since it gives visions of a hard rock in your backyard. Most of the stuff that comes out with the flush looks like sand/foam/sludge/brownish green water/soft green peas/ may be calcified gravel and/or stones, which usually sink, the rest floats.
So try what you want to try, it won't hurt and if it buys you peace of mind, then is good for your mental outlook.
Like the poster above said just the basic flush works. And when people say it worked better with this or that, don't forget there is no way of telling since every flush is different, may be that flush would have been good no matter what.
Telman and another poster once had a discussion that it seems that there is some kind of rotation (or cycle) to how well the flushes work. I can't remember the details.