Sorry but I would have to disagree here. I agree with getting a high GPD rating, but if you go to high then the rejection rate goes down. I prefer to use a 75 gpd membrane seeing as most of them have a 98% rejection rate whereas the 100 gpd usually have a 90-92% rejection rate lowering the quality of your water.From faucet to the rodi. When u get an rodi get one with a high gpd IMO 100gpd is good.