Where to buy....

[albert_dao]

Sure, go to Reefcentral, look up RO membranes and Ebay units.

If one is still skeptical at that point, just PM one of the SpectraPure staff (or any other RO vendor on there for that matter) and they'll provide you with third party data for and against certain membranes.

I know I used an Aquasafe membrane at the store for a while and it was garbage. Switched it with a quality membrane that I ordered from another vendor and all is now well.