Rodi unit reading please help

[marrero412002]

Quick question my Rodi unit is about 6 month old how long can the filter last and I'm doing a water change today buy I'm getting a read of 0.05 tds is it ok or is there something wrong going can't seem to get it to a flat 0.

 

[danka-cedium]

Life of filters depend on many variables.
For instance I change my prefilter every 6 weeks, carbon block every 3-4 months membrane about every year. Di varies.
Normally when my tds moves di is the culprit.
Hope this helps