High micro Siemens on my reverse osmosis system

[Mandrae]

Hello, I have a reverse osmosis system and in the last week or two the micro Siemens level has risen from 13 to 30 micro Siemens. I am not sure as to why this has happened. I haven’t changed anything on the system. The membrane filter is only 7 months old, and the other filters have been changed about two months ago. Any ideas would be a great help! Thanks for your help.

Adam.

[pawaterguy]

Has the number before the unit risen as well? Changes in temp or pressure?

[Mandrae]

I have not checked that. I only have a meter after the process to the storage tank. There are no changes in temp or pressures. Everything has seemed to be stable and then the micro Siemens had just stared to rise.

[pawaterguy]

I have not checked that. I only have a meter after the process to the storage tank. There are no changes in temp or pressures. Everything has seemed to be stable and then the micro Siemens had just stared to rise.

Pick up a TDS meter somewhere and test both. You're dead in the water without knowing what your raw number is.

[Mandrae]

So I have checked the TDS. The softened water going to the unit has 397 ppm, after leaving the membrane filter it has 13 ppm. I hope this information helps. Thanks again for the help.

[pawaterguy]

So I have checked the TDS. The softened water going to the unit has 397 ppm, after leaving the membrane filter it has 13 ppm. I hope this information helps. Thanks again for the help.

13 coming down from 397 is a rejection rate of 96.73%. Your unit is working fine. When it drops below 90% start testing regularly. When it drops to 85% or 80% replace the membrane.