I discovered a couple of sources online to help you, together with CatInfo.org's food chart and Tanya's FelineCRF.org food lists. However, when pretty useful and great, I found these lists were not specifically current, and many of the foods cited as minimal phosphorous on those lists were not beneath 0. https://dogtoys48032.frewwebs.com/36021323/pet-s-an-overview