pressure - Pressure 75 PSI (I manually set it by using the booster pump and restricting the feed a bit)
TDS at the tap - 38 ppm
TDS of the permeate - Heh?:scratchch
TDS of the DI output - 26 ppm
GPD capacity of the membrane - 75 GPD
Permeate = the water purified by an RO membrane. You have two outputs from the membrane housing. One carries waste water, one carries permeate.
I don't know what brand of membrane you have, or what kind of shape its in, but assumming it is a good quality membrane in good working order, If your tap water is 38 ppm,
your permeate should be 1 or 2 ppm
and your DI output should be 0
Your DI resin ought to last a long, long time.
The reading of 26 from your DI is pretty bad - I bet you a dollar the water coming in to your DI is cleaner than the water coming out of the DI.
So, first off, please get a tds reading from the permeate before it enters the DI resin.
When you take tds readings, collect your sample in a squeeky clean glass container, and allow the system to run for 5 minutes before you take your sample. If you are using the same sample container (e.g., a drinking glass) take the reading from your DI output first, then your permeate, then your tap water (i.e., start with the cleanest water first).
Sometimes troubles people report stem from erroneous tds readings.
If your first set of readings were accurate, your DI resin is long ago exhausted, and there is a very high chance it is doing more harm than good at this point.
Russ
