This is a great machine. TDS stays at around 10-13 on the machine. My portable TDS tester confirms the same reading. My tap water is testing about 220 from the tap so the machine is taking almost all of the TDS out. Water is clear and tastes great. I would recommend this machine
Saved me from using so much plastic and a costly under the sink RO. Been using it for 2 weeks now. Itis easy to use. Set up takes awhile but thatis ok.