+1 on aquatic life had for 3 months now and still producing 0 tds cartridges are also very affordable to change out. I make about 25 gallons every month and it’s great for my nano 20 gallonAquaticLife has a 50 GPD system for around $60 on Amazon. I'm not familiar with the brand though. I don't think there are any smaller units than that.
I know the gallons per day sounds like a ton of water, but in practice mine takes about 2.5 hours to fill a 5 gallon jug.


