The organ known as the body's natural filter is the kidney. Humans typically have two kidneys that play a vital role in filtering waste products and excess substances from the blood, regulating electrolyte levels, and maintaining fluid balance. They remove toxins and waste products, primarily in the form of urine, which is then excreted from the body. Additionally, kidneys help regulate blood pressure and produce hormones involved in red blood cell production. Maintaining healthy kidney function is essential for overall health.