When Do You Change Your DI Resin?

[jagermaier]

Usually the DI resin will change color. It starts off blue/green then changes to a brownish color. My chambers are clear so it's easy to check.

[lastlight]

I find my colour-changing resin isn't entirely changed once the tds meter starts reading 1. There are pockets of 'new' coloured resin still... I give the canister a bit of a shake and this gets me usually a few more hours of zero tds but then I replace the resin. I would trust a meter more than the resin's colour if possible.

[jagermaier]

Originally Posted by lastlight

I find my colour-changing resin isn't entirely changed once the tds meter starts reading 1. There are pockets of 'new' coloured resin still... I give the canister a bit of a shake and this gets me usually a few more hours of zero tds but then I replace the resin. I would trust a meter more than the resin's colour if possible.

Yes but I think rastaangle was looking for an alternitive to check DI resin as mentioned their collecting the RO/DI water in the same container as mixing salt in therefore not getting a proper reading on the tds meter. Try collecting a sample in a clean container then doing a tds check on it to do it properly.

[lastlight]

Sorry yes I did miss that.

Non-issue if using an inline tds meter =)

[rastaangel]

I am using a dual inline meter. Its checked after the RO membrane, which usually is 4 ppm. Then again after the DI resin which at this point in time reads 0 to 1 ppm.
I was just wondering when other change there resin, as I usually dont change it until it reads the same after DI as it does before.
Both of my DI chambers are blue so I cant see what color it is

[lastlight]

Then what I said applies. I'd personally change when the reading isn't zero.

[Delphinus]

Agreed with Brett, I switch out the resin when the TDS outputs anything but zero.

Ironically enough with the colour changing resin, the stuff I have right now changes colour well before the nonzero TDS reading. So the colour changing stuff is a really just a rough approximation if anything.