I am posting this for my sister whose diabetic acro cat was recently diagnosed with kidney disease. Phos. level was 6.8. Vet started her on aluminum hydroxide powder. Her numbers had been between 150-230. Since the phos. binder was added 3 days ago, she is in the 70-90 range. the phos. binder is the only thing that's new. Anyone ever hear of this? thanks!