"I order the Ultimate RO-90 with pump, and Ice maker hook up.
Arrived amazingly fast. Was much easier to install than I anticipated. In fact, I was probably over thinking it. I'd say it took me 40 minutes to install. I reviewed the instructions the night before. It really wasn't hard. Fortunately, I already had a tap for the ref ridge water/ice, so I didn't have to deal with that.
Not one leak. The quick connects worked great.
My TDS at the TAP is about 102. the fridge water, w/carbon filter only was about 45. After the RO system was installed, and flushed, the filtered water, and fridge water is 2.
Nashville City water is pretty good, I just wanted al the other stuff out of it (fluoride, chloride, et.al.)
I also installed the flood safety cut off, because, well, just in case. That too was easy enough to install, and cheap insurance.
I probably didn't need the pump on it. I have my house water pressure regulated at about 45 psi. I suppose I could have turned that up a bit. But the pump does fine. It really does nearly fill the 4 gallon tank from empty in about 3 hours. It put ample pressure in the tank, and the output at the tap is very strong.
The downside to the pump is, it makes a thunk/tick about once a second until the tank gets near full. It would have been once if they could have dampened that a bit. It's not bad, but it is noticeable. there are some things I might try to baffle it.
I'm very satisfied and would recommend them to others."