Latest line is from homebrew supply store.
EVA-BEVERAGE TUBE 8MM-5/16".SOLD BY THE METER.DESCRIPTION:formulated from Ethylene Vinyl Acetate, a food grade compound which will not taint beverages.It has good flexibility, a mirror smooth bore and excellent abrasion resistance.COLOUR: Translucent.Temp Rating:-20 to 75 C.DIMENSIONS:OD 8mm ID 5mm. Working Pressure:40 PSI @ 20C.
Used simple vinyl previously and that was similar but worse. Noticed my friends dont have the same problem with thier beer with the same lines. Therefore I think something in my beer is promoting this reaction in the line. Just looking for ideas on what might be doing this?