I found a handful of methods online to help you, together with CatInfo.org's food chart and Tanya's FelineCRF.org food lists. On the other hand, even though really helpful and excellent, I found these lists weren't specifically up to date, and a number of the foods cited as reduced phosphorous on https://catfood11098.shivawiki.com/7422649/5_simple_techniques_for_food_delivery_abu_dhabi