I have had a brand of bottle top filters that were made of polysterate plastic and I could only run 200ml through it before the plastic would begin to become sticky due to breakdown from the time the solvents and oils were in contact with the filter funnel. At times the brew would be cloudy if I tried to use it for longer periods of time and I would have to refilter it to clear it up. The nylon membrane never gave any problems. I have since started using filters made with polypropylene funnels and nylon membranes and haven’t had any more problems.