Help with Nylon Membranes

[Ed Madison]

We have been using S&S Nytran for several years with good results.  I
think I saw an earlier posting stating that S&S Nytran has been changed
recently and that the old product was available from another company. 
Unfortunately, we need to re-order, and I can't find the earlier posting. 
Could someone please remind us where we can order the original product. 
Thank you very much!