All good tips and advice.
If you still live in Centerville, the tap water is pretty clean, cleaner than most cities. The latest water quality report shows average TDS for all wells is 212 ppm. Here is the link to the very brief summarized 2013 report.
http://www.centervilleut.net/downloads/water/centerville_ccr_2013.pdfTo have 12 ppm coming out of the RO is probably an indicator of low water pressure. When I lived there, Centerville had good water pressure so it's probably a Pressure Reducing Valve at the house water main keeping the pressure down, like millsu2 suggested. The valve is usually located where the water line enters the house. I believe to increase the pressure that bolt on the top of the valve(pictured in millsu2's post) is turned clockwise as though it is being tightened. I believe that typical RO Membranes perform best at 60-80 psi.
This is unlikely, but if the membrane is more than 2 years old, is poor quality or defective it could have developed a flow through leak where the membrane is deteriorating. A little tap water flowing through a teeny hole can contaminate the product water. They are supposed to produce 5000 gallons of purified water.
I don't use DI so I usually wait until the water is at 20+ TDM before I change the membrane. There is plenty of life to eat up the hard water that's leaking through, especially when some of the major minerals in tap water around Utah are Calcium, Alkalinity and even Magnesium
(the summarized water quality report does not indicate this but it's true).
Aloha
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