This is a photo of an SSI PTFE membrane that operated under septic conditions:

Here is another one, also in septic conditions:

This is a photo of an SSI EPDM membrane and an SSI PTFE membrane (1st generation) at a dairy plant in Quebec, Canada, both after 1 year of operation.

This is a photo of a competitor’s EPDM membrane that operated under septic conditions:

After looking at these photos, it should be quite clear what is the purpose of a non-stick barrier layer on an elastomeric diffuser membrane.

SSI manufactures patent-pending PTFE and fEPDM fine bubble and coarse bubble membrane diffusers.