In order to simplify replacement of the sterile filter and to simplify the production of the lid, the sterile filter and filter holder form a filter unit and the filter holder is mounted on the lid.

Furthermore, there is provided a sterile filter (3) in said inlet port (2).

The aim of the invention is to prevent undesired liquid from reaching the sterile filter (62).

The sterile filter, in a sterile position in which the sterile filter obturates the gas exchange opening, is retained between the first and the second retaining element.

and the next step we're going to do is take the sterile filter paper.

The aim of the invention is to provide an improved container which has a simple design and avoids damages to the sterile filter.

The sterile filter (5) has for that purpose a heating device (26) for generating steam.

The upper chamber (2) is separated from the filter chamber (3, 4) by a membrane (6), and a filter (7), such as a sterile filter, is fitted in the filter chamber (3, 4).

The sterile filter must be fitted in a filter housing that allows in situ steam sterilization or that can be easily opened.

This second sterile filter is arranged in the dialysate fluid circuit between the first filter and the dialyser in a positive pressure area, which is separated from the rest of the downstream dialysate circuit.

This of course also applies for the compressed air, whereby a sterile filter is often utilised for treating it.

So there is always a risk of mycoplasma slipping through sterile filters.

The filter unit comprises at least one sterile filter held by at least one support element, such that the risk of contamination of the sterile filter on the exchange thereof is reduced.

Then, the media carboy and air supply with a sterile filter are connected before turning the air flow on.

The portion of the dialysis fluid system which includes the volume located downstream of the sterile filter is subsequently not filled with a frost protection agent.