I have recently purchased a new 450 GPD RO unit as a back up as I have damaged my last 300 GPD RO unit during the really frosty spell,however I recieved it yesterday and altough it is supposed to be the upgrade to another 150 GPD both my new 450 and old 300 GPD unit look completly the same,I have paid obviously more for the new one but how can I tell that they have sent me the 450 instead of another 300 GPD unit,they have 3 membranes on top but on one unit they are supposed to be 100 each and the new one 150 each but can't tell the difference as both units have the logo but nothing showing membrane size etc.
I have always dealt with this company and their service is excellent but mistakes can be made,just want to be sure.