TDS Meter and Color Changing DI Resin

[PatMayo]

I use a color changing DI resin. I also use a TDS Meter. Upon changing the Resin I always get zero TDS on the meter. However after the resin starts changing color say maybe the bottom 1 to 1 and 1/2 inch of the resin the TDS starts climbing.

I guess I have 2 questions. My TDS meter is digital and has 3 digits. Can I assume that 001 TDS is actually .001 and of no concern? (a thousanth) I have been changing the resin when the meter reads 001 and gosh I go through a ton of this stuff and it's not inexpensive.

The second part of my question is at what point should I change the resin? .100 or some measurment before that?

Any help would be welcomed.

Regareds,

Pat

[jbarone]

When the meter reads 001 its 1ppm. You may have other issues with your unit if your getting readings with that little use of your DI

[lilchris]

http://www.reefcentral.com/forums/showthread.php?s=&threadid=1224274
If you post in this forum, The Filter Guys, Jim will help you out. He is awesome.
Ask Jim

[bertoni]

I agree with talking to the vendor.

[PatMayo]

Thanks guys. I have sent an email and posted on the site.

Regards,

Pat

[SlowCobra]

I have found that the color changing resin is a waste, at least for me. Mine changes colors long before my TDS meter starts showing any TDS. It's good for a quick visual but I think many people prematurely change the resin because they don't want to buy a TDS meter.