I take tums (500 mg of calcium carbonate per tablet ) 1 at breakfast, 1 at lunch and 2 at dinner and have never had a problem with phosphorus unless I've been eating cheese or oatmeal.
I take Calcium Acetate, when I take something. I do have an 8% kidney function, so I get away with a lot.I was faithful to my prescription until I got suspicious – for no particular reason. My blood work had all good numbers. Then I quit taking my binders and my numbers did not change. Hmmmm!gl