I'm replacing my RO unit membrane with a GE model FX12M membrane that I just purchased from The home Depot. The original membrane is a GE model TFM-50. On the box with the new membrane, I do not see the GPD rating. I did a "google" on it and did not find the GPD rating. The old membrane GPD rating is 50 GPD. Has anyone replaced there RO unit membrane with the FX12M model ( i.e. from Home Depot )? Looking for a recommendation for a the new membrane model FX12M. I would like for it to be 50GPD. Thanks.