DI resin expired already?

[hillegom]

Is it a dual inline tds? They can be calibrated, but it comes calibrated from the factory and 3 months is not a long time. Unless of course, it was bounced around during shipping.
Maybe the LFS would check it where you bought it with their water.
But even 1 ppm is not very much. Some people are using tap water without any trouble
(not that I would recommend this though)

If you have a dual tds, what is the tds of the incoming water?
What is the tds of the exiting water from the membrane, before the DI?

[mark]

all depends on the post RO measurements to how hard the DI needs to work.

TDS last time I measured in Edm was out of the tap at 168, 007 after my membrane and still get more than 6 months out of my DI resin. This is at about 2g a day plus water changes.

[NastayNatron]

Its leaving my membrane at between 1 and 2 ppm. Im starting to think maybe I got a bad DI replacement cartridge. . . Its a coralife R/o Unit