What TDS is your RODI at and what meter are you using?

[40g Nano]

I have 1 TDS with a hanna checker

 

[Spare time]

I run 0 and change my DI when it goes up. Check the hanna instruction card to check the margin of error on the tds meter.

 

[daybreaksky]

4 after RO and 0 after DI, would change DI after it gets up to 1. luckily i don't have a lot of CO2 dissolved in my tap water.
I just use a cheap tds meter i think it was $10

 

[LxHowler]

Mines at 0. Change the di resin if it rises to one. My tester is just a cheap set from Amazon that came with a pH tester aswell

 

[Pillahump]

0 here =)

 

[Spare time]

I use to be ok with a few points until I realized that I have no clue what those few points are.

 

[mindme]

0. I change them out every 6 months minimum, and the DI resin more often than that as needed.

 

[Conchman]

Also zero, creeps to 1, the color changing resin has expired, brown and I change it.

 

[Mical]

4 after RO and 0 after DI, would change DI after it gets up to 1. luckily i don't have a lot of CO2 dissolved in my tap water.
I just use a cheap tds meter i think it was $10

I'm the same - 4 after membranes and 0 after Cation,Anion & mixed Bed resins and I use the HM Digital dual TDS meter

 

[lapin]

3 di resin beds.
Meter reads
20 in coming water
1 after 1st resin bed
O after 2nd resin bed
2 after mixed bed ( prob a meter error)

 

[Tastee]

I also use a pair of dual TDS meters that look exactly like the HM Digital ones above. 4 stage RODI. Incoming water varies from 95-70. Post sediment and carbon is a couple of points lower. Post RO is typically 1 after the 2 min flush cycle finishes (usually starts around 50). Post DI is 0. As I’m lucky enough to have good quality incoming water I get good life out of all my filters - still working on the original RO and DI after nearly 3 years.

 

[T_BONE]

My tap water coming in usually runs around 120 and my Post RODI is always 0. I use HM Digital dual TDS meter also. Mine is a 6 stage with the last two being color changing DI Resin When the FIRST stage of the DI resin starts to change colors I change BOTH out with new Resin.

 

[homer1475]

4 stage water saver unit from BRS here. Never use anything above 0 TDS.

Fortunately my water is pretty clean with an incoming TDS of only 24, 1 after RO, and 0 after DI. I use a triple inline TDS meter from HM Digital.

DI gets changed after reading 1.

 

[magikfly]

0 TDS, cheap chinese dual (preiodically calibrated) tds meter and verified with ATI ICP tests.

 

[AlexKintner]

5 stage from BRS. 4 TDS after RO... 0 after DI

Still need to test from the tap. Based on the hardness I'm guessing it's north of 200.

 

[mindme]

The thing that kills me about have more than 0 TDS is - what in the world is that 1 TDS?

 

[Pistol Peet]

My TDS sits around 3 can't get it any lower than this though I have high TDS in the water where I live I only use the TDS meter that is on the Rodi unit itself and if it changes or moves off that 3 then I change out my DIresin

 

[Mical]

You guys have some awesome water sources. I live in a rural town west of Minneapolis and we have basically city treated well water. TDS straight from the tap is about 280. When we lived in a suburb of Minneapolis we had 80 straight from the tap and I would go through a single mixed bed resin in about 6-8 mos. Since moving to rural town I was going through a full size mixed bed resin in 6 weeks or less. I switched to the Cation, Anion & mixed bed resins and I go through Anion about 3.5 months the others haven't been changed in 8 months and are barely showing any color change.