DI Resin Being Consumed Rather Quickly?

There's a lot of good posts on this thread...check it out. http://www.nano-reef.com/forums/index.php?showtopic=218232

Have you done a test on your RO water to see what your TDS level is right out of the membrane?

--AJ

 

That is what I would do too. It also isn't a bad idea to just get an electronic in-;ine TDS meter. THey sell them at BRS with two electrodes for around $30. This is a great way to see your tds right after RO as well as right after DI (or you can simply see TDS of water coming in from the tap to going out, or really any combination there is)

 

I thought my resin was being depleted at an alarming rate, but I've kept watch on the tds of the product water and it stays at zero, so it may be that it looks used up but is still doing the job.

 

Mine is used up about 3 times faster than that! I only get 100g of zero tds before I have to change mine. My tds is 780 out of he tap so it gets used up quick. I change mine every month it sucks but got to do it.

 

Agree...I continue to use my DI resin until I see the numbers start to show measurable TDS levels in the water....I don't use the color change as my only indicator. 
Bela's recommendation of using an inline TDS meter is good.  I use them.  I like the one that shows you both the pre-filtered and post-filtered water at the same time the best (there's one inline TDS meter where you have to slide a switch and hit the button again to see the 2nd value, etc).  My suggestion was the check the RO water.  You can do this by disconnecting the tube that goes into your DI canister and letting your filter run...let it run into a cup for a few minutes, dump that water, then test the new water in the cup.  Do the math to see if your membrane is working right.  A 98% rejection rate membrane should turn 300 TDS water in, into 6 TDS water out.  I always fudge those numbers a little bit too...like maybe saying 10 or 12 would be acceptable.  If they are higher than that, then you may be in need of a membrane replacement.  When I got my first membrane from AWI, it was bad and they replaced it free right away.
--AJ