SSI continues to follow Redmon Engineering’s independent study of SSI AFD350 PTFE disc diffuser membranes installed at the Fox Metro WWTP in Elgin, Illinois (Chicago metro area). This study was funded by the Fox Metro Water Reclamation District and results have been shared with SSI.
After 2 years and 5 years of performance, the data have shown consistency in both SOTE and “as is” and “cleaned” headloss of the tested samples with “new” diffusers from the same batches.
Below is a photo of the 5 year old sample which tested out like “new”.
It is an outstanding result for PTFE, considering that according to many published studies, plain EPDM membranes lose 20% or more of their efficiency over a 5 year period.