I did say in the first line I will speak to the vet. Most senior foods have reduced phosphorus. The higher the muscle meat used, the higher the phosphorus (I am also doing an animal science degree) I know they use calcium additives for reptiles to get the balance correct so it sounds plausible to do this for cats as well. In fact, last year I dealt with a woman on the cat line who wanted to donate lots of cat food to us. She said one of her cats had been diagnosed with CRF and as she fed all her 6 cats at the same time, she planned to feed them all Hill's k/d
. I asked my vet about it and he said it would be fine - and that is ultra-low phosphorus. All I was thinking of doing was using 1/4 measure or so of Ipakitine which isn't a particularly effective binder anyway - it is mainly calcium carbonate and chitosan - just to reduce the phosphorus absorbtion a tad.