You will purchase bags of sterile fluids and inject the prescribed amount of fluid beneath the cat's skin on a regular basis. Use a sterile needle each time. Insert the needle just under the skin, and then turning the wheel on the valve that controls the fluid flow, takes practice. Getting the tip of the needle in so that it is not too deep and does not pop out is the most difficult part for some people. Always mark the bag, record the injection point and make sure that you alternate injection sites.
Dietary management is also potentially helpful.
By decreasing the protein intake, waste products of protein digestion in the blood stream decrease. This reduces the work load of the kidneys. Some cats will eat this diet while other refuse. These diets are also low in phosphorus, which is usually retained in the blood stream in cats with CRF Chronic retention of phosphorus can lead to a mineral imbalance, resulting in calcium being leached out of the bones. Increases in phosphorus also cause severe irritation of the stomach causing nausea.