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Yes, charcoal will filter toxins from the kidneys. Here is a very encouraging story about the use of charcoal for kidneys.
http://www.charcoalremedies.com/kidney_disease
Also, on that website, if you type in the search box "kidney dialysis" you will get a number of other pages that mention it. You may have to scroll down to find the part about kidney problems on each page, but there are many exciting stories of charcoal being used to treat kidney problems.
Basically, your wife can take charcoal internally and use poultices over the kidneys. Internally, she would want to take charcoal 2 hours after or before prescription medication. You can get charcoal capsules or tablets, or just put 1 t. Of activated charcoal powder into a glass of water. If you can time it properly, you would do this twice a day. But once a day is good to start and see how that goes.
I know a man who used a charcoal poultice over his kidneys overnight and by morning the poultice was soaked with urine! it was definitely drawing out from the kidneys. And I believe the charcoal helped him, but I can't recall the details - it was a long time ago.
To make a charcoal poultice, you will mix 3 T. activated charcoal powder with 3 T. ground flaxseed (you can also use cornstarch, but I prefer the flaxseed. ) Mix this in a paper cup. Add about 2/3 cup of water and mix with a plastic spoon. (You don't have to use disposable, it is just easier than cleaning up the charcoal. ) Let it sit a few minutes and it kind of gels up. You may need to add a little more charcoal or water to get a good consistency. You will get the hang of it quickly. Spread the charcoal over a paper towel. Top with another paper towel. (Try not to let it get to the edges--it is messy if it comes out. ) This will make about 4 poultices. (Not sure if you will need one or two at a time. Keep extras in the refrigerator for a week or two. ) Place a poultice on the back over the kidney area. Cover with plastic wrap. Use an ace bandage to attach to the body. If you could do this over night, that would be ideal. You can do this as often as you like. You may need to do it very often - maybe 4 nights a week.
Be aware that charcoal has been used to lower blood pressure. (I believe charcoal baths were used for this. ) Anyway, it is something to be aware of.
Regarding diet, I am assuming the "white flour diet" is to keep it a low protein diet as protein is hard on the kidneys? I don't want to suggest anything that would counteract what your doctor suggests. You might ask him about fruits and vegetables that would be okay for her to use. I think the nutrients in those would be important. Also, plenty of water is important.
Also, read through Earth Clinic's kidney page and you may find some ideas for diet and other things to help your wife. She is blessed to have you as her advocate!
https://www.earthclinic.com/cures/kidney_disease.html
Please keep us posted and let us know what helps your wife!
~Mama to Many~