Should probably mention the Chanca was a liquid tincture, and not a powder/capsule. I imagine that is important for making sure the herb actually gets into your kidneys more easily. I honestly wish I could be more helpful, but I am hesitant to do so since it is really my wife that is the herbalist. All I have is the experience to share. There may be some herbalist doctor nearby that takes walkins with decent reviews-- it is suburban Massachusetts, so, it seems like a decent bet.
I also don't want to be recommending shit that is gonna break your bank if I am not certain it would work tho. There are different kinds of KS, and I have no way of knowing if the ones you have are a result of the same sort of buildup that I have.
We spent 50 bucks on this one, getting some herbs from a local store run by Mormons that she used to work at back in the day. Sourcing is another tricky issue with herbalism and supplements in the USA, and there's a lot of people selling bunk trash out there.
Confident recommending that you should basically be chugging gallons of water, however, and it is a functionally free thing to do. Hope that shit passes one way or another soon.