Inclusion Criteria:  Age ≥18 years . Patient on chronic haemodialysis admitted to the hospital with a diagnosis of infection by COVID-19. Signature of informed consent or legal representative. Estimated duration of admission greater than 8 days (4 haemodialysis sessions). Patient with haemodynamic stability, understood as systolic blood pressure ≥ 100 mmHg.  Exclusion Criteria:  Refusal to sign the consent form. Patients who for clinical reasons are unable to follow a regular dialysis schedule of three sessions per week. Allergy (documented or suspected) to either of the two membranes involved in the study. Patient with haemodynamic instability (Mean arterial pressure < 100 mmHg).