The organ that filters waste from the blood is the kidney. Humans typically have two kidneys, which are located on either side of the spine. Their primary function is to remove waste products and excess substances from the bloodstream, regulating blood pressure, electrolyte balance, and fluid balance in the body. The waste filtered from the blood is excreted as urine. Each kidney contains millions of tiny structures called nephrons, which are responsible for the filtration process. Maintaining healthy kidney function is crucial for overall health, as they play a vital role in detoxifying the body.