RO/DI on well water

[FYRSQL]

A friend is setting up a new 180g system and using a RODI system that he acquired.

Initially the output was reading about 40 on two separate TDS meters. We changed the 3 filters and it was reading zero.

About 30 gallons later its now reading almost equal to the input on two separate meters.

The input is well water, conditioned with a culligan system, and has a TDS input around 250.

Any ideas?


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[reefer1970]

Is the reading of 40 after the to membrane or after the di? I just moved to a well with 250 approx tds and get 8 tds after RO and 0 after DI. Btw, check your water pressure. I had to add a booster pump and added a second ro membrane while I was at it and now I make a 4 gallon jug in under 30 minutes


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[FYRSQL]

Is the reading of 40 after the to membrane or after the di? I just moved to a well with 250 approx tds and get 8 tds after RO and 0 after DI. Btw, check your water pressure. I had to add a booster pump and added a second ro membrane while I was at it and now I make a 4 gallon jug in under 30 minutes


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Now it's not even reading 40. It's reading almost same as input. Measurements are after entire system....


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[reefer1970]

Must be an old membrane or spent di resin?


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[Ou8me2]

You could have a Co2 issue with the well water. If you do you'll eat through RO membranes and DI resin like a hot knife through butter. Also, you will need to degass the source water to get rid of it. You can buy a test kit and find out.

I'd almost bet this is the issue if I understand you right after the 30 gallons your TDS output is reading 250 after it being at 0 for 30 gallons.

 

[ca1ore]

Sorry, you are saying that the TDS Meter after the RO and DI stages reads the same as the raw input, so 250? If so, check that the waste line is not blocked. I had mine get frozen one time and couldn't figure out why my DI got eaten so quickly and the output TDS was so high. FWIW, on a well, my input raw is around 300, I get 3-4 out of the RO stages, 0 out of dual DI stages. DI stage last about 200 gallons.

 

[Elricsfate]

I am running an RODI on a well, as well. Though I have to wonder what is leeching into your water at the actual well. My TDS coming out of the spigot is 14. After RO it's 3. After DI it's 0.

But I too went through the DI resin faster than I thought I should. (Less than 200 gallons). CO2 was the suggested culprit for me as well. Though I think the process for removing it is more complicated and time consuming than simply paying for DI resin more frequently than I would prefer.

 

[125mph]

Is your DI color changing? If it is, you can tell if its depleted. If its not depleted and you are not seeing a drop in TDS, something is jacked!

 

[ca1ore]

I am running an RODI on a well, as well. Though I have to wonder what is leeching into your water at the actual well. My TDS coming out of the spigot is 14.

That your raw is 14 is fortunate for you. Most wells are much higher than that, not because anything is 'leeching' at the well but because well water has been sitting in the ground for hundreds, maybe thousands of years with ample time to pick up dissolved minerals and other substances.

 

[FYRSQL]

Raw is 250. I got it to zero but only for about 30 gallons. Thought about changing membrane but didn't want to pay if something else. Will test CO2 and go from there. What is considered high CO2?


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