RO\DI unit

[madball13]

Hi all!

I have this RO/DI unit i purchased a while back and wanted to get some refill cartridges for it. However im not sure what the 3rd canister is that came with the unit. Can anyone tell from looking at it what it might be so I can order it? TIA

 

[madball13]

Here is a pic

 

[mrtint]

DI resin


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[madball13]

Thanks, thats what i thought it was but wanted to make sure