Medical apparatus for renal replacement therapy; apparatus for hemodialysis, and/or hemofiltration, and/or hemodiafiltration; and accessories therefore, namely filters for dialysis fluids, dialyzers, dialysis monitors, disposables for dialysis, namely, tubing and tubing sets, cannulas, catheters, containers and tubing for preparing dialysis fluid and other medical fluids, drip chambers, expansion chambers, temperature meters, conductivity meters, pressure sensors for measuring pressure in medical tubing, flow meters for measuring flow in medical tubings, ion strength meters, heat exchangers, devices for heating and cooling, namely blood warmers, apparatus for measuring of urea and other substances in blood; apparatus and means for preparation of dialysis fluid and other medical fluids, namely replacement fluids, disinfection solutions, cleansing solutions, decalcifying solutions; water treatment equipment intended for medical use,, namely, reverse osmosis machines; bags and cartridges for concentrates in solid or liquid form; membranes intended for medical use, namely filters for dialysis, hemofiltration and hemodiafiltration.