RO membrane replacment

[Reefbound]

Afternoon all, I was wondering how often do you replace your RO membranes?
Im fortunate enough to have good "city" water and my incoming TDS is only 65 to 68. I have had the unit for two and a half years and I have replaced the three main filters but I have not touched the membrane.
My TDS is still zero but Im wondering if it should be replaced.Also I do have a flush kit installed which I do once a month.

 

[DonW]

You need to monitor tds prior to the di to determine wether or not your membrane is declining.

Don

 

[Reefbound]

You need to monitor tds prior to the di to determine wether or not your membrane is declining.

Don

Thanks DonW,

I'll have to move my inline meter then, I have it after the DI unit.

 

[burning2nd]

ha... insult to the well pump... lol

i got well water and have the same tds as you.....45-70ppm in- 0 out after 2 di's

i replaced my Ro once so far in the last 3 years...



Im thinking of geting a 2nd TDS meter so i can monitor fresh inlet, after Ro, and then b4 and after the Di's