Colour Changing DI Resin question

[taxman95]

This is my first time using colour changing DI resin. It is a Spectapure cartridge, not a refillable one

Only the top half has changed colour, not the bottom half.

Does this mean it should be changed, or do I wait until the whole thing changes.

 

[cpllongjk]

do you have a tds meter? I would go off the tds meter rather than the color change. Some people change the filters when they stop getting 0. But really you can survive with 3-5ppm from the tds meter. Anything more than that and you better replace them.

Before DI you should have about 10ppm. DI will bring it down to 0.

 

[taxman95]

I'm at 4 after the DI