Calcium itself will bind phosphorus in the intestines so that it will not be absorbed. Calcium lactate is often given, but you could use calcium carbonate, which is chalk, also known as Tums. Oyster shells are mostly calcium carbonate, with very little phosphorus. Calcium absorption and utilization is controlled by activated Vitamin D and Vitamin K. Activated Vitamin D can be risky, as calcium is often deposited in unusual places, causing problems. Meat and most animal products have significant amounts of phosphorus, but giving large amounts of calcium will control that. Give plenty of yogurt or probiotic, as the bacteria utilize the urea nitrogen and the phosphorus in growing. In many cases, the cat is losing protein through the urine, which must be replaced, either through the diet, or from body reserves, leading to loss of muscle mass.

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