Hemodialysis membranes transport requirements

Hemofiltration is similar to hemodialysis, but uses convective transport across high cutoff point membranes to clear toxins. Clearance is slower and requires up to 24 h of continuous use in the clinical setting, which can he advantageous because this reduces the impact the device has on hemodynamic stability, unlike standard hemodialysis devices that can cause hypotension during treatment. Fluid is lost with this method and must be replaced in the patient, typically with a sterile isotonic solution. Hemofiltration can be used in combination with hemodialysis and is called hemodiafiltration. 

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