DI Resins

[andrewsk]

Just curious how many gallons many of you get out of your RO/DI systems before you need to change the cartridges?

I have read online that you can get approx 400 gallons per DI resin cartridge but I think mine is a fait bit lower than that. It seems to turn from Black to Light brown a lot faster than that.


Thanks!

[EmilyB]

Check the TDS output after your membrane. Your DI, at this time of year should last a long time, I run mine daily.

[sumpfinfishe]

Andrew, as Deb suggested already the best way is to check your TDS.

I bought a handheld TDS years ago when I got my RO/DI and it's paid itself off a housand times. For $30 a meter can check your main water line, RO, DI, and waste water lines, heck if your bored you could even buy a few brands of bottled water to see who's got the cleanest H2o not that I have done this of course

[andrewsk]

Thanks guys. I do have a TDS and generally wait for the readings to rise before replacing the filters. It is normally about 17-25 ppm. (It used to hover at 0 or 1 when I first got it but not anymore even with all of the filters changed)

I assume that when the DI cartridge has changed color though that it is out or at least close.

Do you guys use cold, hot or mixed water?

[sumpfinfishe]

You might want to calibrate your TDS, you should be able to get the solution at your LFS and see if that changes anything.

[EmilyB]

You should only use cold water.