Purchased the same membrane that I always do the $35 one. A couple years ago this membrane worked flawlessly and kept my TDS 10-15ppm. The new ones are no good. I couldn't get them under 40ppm. BLA BLABLA about whats going in BLA BLA BLA. Nothing has change with my water source.
But what has changed is that they now offer a 99% rejection membrane. Well I was getting 98% with the old $35 one. For me 1% isn't a big deal and thats why I got a new $35 membrane. The new membrane only gave me a 92-94% rejection. Called them up. No real help with the issue.
What I really think happened was they found a way to charge more. The "NEW" $35 membrane I believe is a sub-par model. And the "NEW" $60 membrane is the old $35 one with a "NEW" higher price.
I now use DOW membranes with a cheaper cost and better results.