How is excess water removed from the body?
One of the functions of normal kidneys is to remove excess water. When your kidneys are not working well, your body may not produce very much urine. Excess water is removed during dialysis by a process called ultrafiltration.Blood entering the dialyzer is placed under pressure to push excess water through the dialyzer membrane. Settings on the dialysis machine can be adjusted to remove as much or as little water as necessary.