I bought the APEC ROES-50 over three years ago and installed it myself under our sink. It is supposed to make 50 gallons a day of water if needed. (I doubt we ever came near that even when we had four adults and two babies in the house but the water is terrific. (Some want the system that adds minerals but there is really no need. I did some serious research back then.) There is a lot of information online and you can get good deals. (So many types)
I actually bought the system from Lowe's online but I bought the filters from the main site when it was time. (I also bought the refrigerator adapter at the same time. The ice is super as well. (The installation is not that bad but I have the plastic waterlines and sure do wish I had copper waterlines.) (I replaced the three filters at about a year and a half and they needed it. This time I have all five.) (Oh, I did not replace the filters today, had several things come up unexpectedly. Will try again tomorrow.) (It does take about three gallons of water to make one gallon of the pure stuff.)
I bought it initially at the time because I was carrying cases and cases of bottled water up two flights of steps nearly daily. The water compared to any bottled water I have ever tasted cannot be compared. It is so very pure.
Thank you for this information! I will share it with my wife in the morning. It should help in deciding