
This portable Ro/Di is pretty good and makes my reef water supply pretty affordable. I currently have a 50 gallon tank and it would be perfect for initial fill and maintenance or topping up my setup. I installed the unit (for which I ordered a 50 gallon per day membrane, not knowing that my water pressure was high enough to use a 100 or 150 gallon per day membrane) and began making a 50- Filling gallon keg to fill my tanks and so on in 15 hours I have 35 gallons. . That should be pretty much on the money promised by the GPD. Only time and water changes will tell how long this unit produces 0 TDS for me. I will update my review once I can give an honest opinion on whether I should have bought a larger filter.

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