So I currently have a 90 gpd RO system from spectrapure and need to change out the current RO membrane. I also want to add on a second RO membrane on the waste water line from the first RO membrane. What brand is everyone using. I looked at just reordering from Spectrapure or using one from BRS instead. The BRS ones cost way less but not sure if they are as good as Spectrapure. What are everyones thoughts? Also what DI resin is everyone using? Thanks!