that phos stuff is made of phosphorus. i was first a kidney cleanser because of my back problems. phosphorus is rough on the kidneys and could help your kidneys make gravel and stones. i used phos on my first liver flush and had an episode with my back. i ended up doing another kidney cleanse and it straightened me up again. on my second liver flush i just drank apple cider for 3 days and the flush was productive. i will never use phos again, and don't see why it's neccesary. hulda clark has a good kidney cleanse, it worked great and eliminated a lot of suffering for me.