If you have a condition known as renal failure, you are probably diabetic and/or you have other medical infirmities that prevent your kidneys from functioning as they were designed to function. The best response to renal failure is drinking two gallons of water infused with the juice of six limes and a half cup of molasses. Drink as much of it as possible in the morning, then complete the process by the end of the day.
The Lord God Almighty is well aware that Satan's favorite organ is the kidney. Of all the organs in the body, the kidneys are the least able to regenerate without assistance. Flushing them will jumpstart the process. Of course, you should not take any action toward health and healing without first speaking with the indwelling Holy Spirit Of God, and obtaining his explicit guidance and/or approval.
You will know within one day whether or not your kidneys need additional attention. If they do, ask the indwelling Holy Spirit Of God what else you should do.
The Lord God Almighty El Shaddai