The Hemoflow F3, F4 and F40S dialyzers; and the Optiflux F16NRe, F18NRe, F160NR, F160NRe, F180NR, F180NRe, F200NR, and F200NRe dialyzers are designed for single-use acute and chronic hemodialysis. The Optiflux F250NR dialyzer is intended for patients with acute or chronic renal failure when conservative therapy is judged to be inadequate. The Hemoflow F6, F8, F60A and F80A dialyzers and Optiflux F200A and F180A dialyzers are designed for acute and chronic hemodialysis and are appropriate for single and multiple use when reprocessed utilizing the methods described in package insert