TDS readings

[fjfarias]

I recently set up a used RO/DI system w new cartridges. First 20 gallons my readings were 75 in / 0 out. Overnight my out readings went up to 30. Faulty probe? Clean? Thanks in advance!

 

[blaxsun]

Did you flush the sediment/carbon cartridges before adding any membrane/resin ones?

 

[fjfarias]

I didnt. I just did though after watching a few YT videos. Removed the flow restrictor and let it run for a 1/2 hour. Numbers are still in the 30s after running for 5 mins or so. Should I let it run to waste for a little longer ? Weird how it was 0 for maybe 25 gal or so.