What's wrong with RODI?

[cutterx23]

My RODI is acting a little funny, wonder if anybody knows why. It normally reads 4ppm In on the TDS meter and 0 Out. Last time I used it a couple days ago, it was reading 7ppm In and 11ppm out, I used it again last night and it read 5ppm In and 13 Out? Very confused. My DI chamber is still completely clean blue, hasn't changed color anywhere at all, was purchased about 4 months ago. All other filters were newly replaced at the same time. All are white and clean (a little bit of brown on the first chamber but barely at all). I've tried flushing it, that doesn't help. Has this happened to anybody else? Could it be a faulty TDS meter? Any suggestions?

 

[rollo]

Torn membrane? When was the last time you changed the RO membrane? Ask AZdesterrat. He has worked with water systems for 20 years and knows his stuff. He helped me set up a system.

 

[AZDesertRat]

To troubleshoot the system you need 3 TDS readingd, tap water , RO only and final RO/DI.

Isuspect your only issue is your DI resin is exhausted. A reading of 5-7 on the RO only or IN probe of an inline TDS meter is not bad at all if you have normal tap water in the 200-250 TDS range.

Never everely on color changing resins, they can be very unreliable, changing in streaks, top to bottom, bottom to top, not at all, all at once etc. A good handheld TDS meter doesn't lie and is much more eliable and accurate than the dual inline plus it allows you to test your tap water TDS, ATO TDS, bottled water, LFS water, your buddies water etc. The inlines are not temperature compensated and cannot be calibrated so lack the accuracy of a $20-$25 handheld like the HMDigital TDS-3, TDS-4TM or AP-1. I have two dual inlines an never even turn them on, they never agree with either of my handhelds which I trust.

I doubt you have a membrane problem or anything more than exhausted DI resin.

 

[rollo]

Yeah him ^ lol... Thanks again AZ, ordering my handheld tonight.

 

[cutterx23]

To troubleshoot the system you need 3 TDS readingd, tap water , RO only and final RO/DI.

Isuspect your only issue is your DI resin is exhausted. A reading of 5-7 on the RO only or IN probe of an inline TDS meter is not bad at all if you have normal tap water in the 200-250 TDS range.

Never everely on color changing resins, they can be very unreliable, changing in streaks, top to bottom, bottom to top, not at all, all at once etc. A good handheld TDS meter doesn't lie and is much more eliable and accurate than the dual inline plus it allows you to test your tap water TDS, ATO TDS, bottled water, LFS water, your buddies water etc. The inlines are not temperature compensated and cannot be calibrated so lack the accuracy of a $20-$25 handheld like the HMDigital TDS-3, TDS-4TM or AP-1. I have two dual inlines an never even turn them on, they never agree with either of my handhelds which I trust.

I doubt you have a membrane problem or anything more than exhausted DI resin.

Awesome man!!! Thanks so much! Water genius. I'll have to get one of those and give it a test and possibly replace the DI resin. Thanks again!