Ro/di

[Bfofre]

Just wanted a reality check..
Installed my  dm-1 dual inline tds meter today..
I'm monitoring levels after ro membrane and the again after di.

Does it seem possible that I get 2ppm tds after ro?  Then 1ppm after di?

I have new di resin,  but don't feel the need to use it when I'm still getting 1tds.  However if it's going in at 2, probably should be 0

Sent from my SGH-I747M using Tapatalk

 

[DerekL]

Mine out of the to membrane run 1 or 2 and 0 after DI yes it should be. My water out of the tap measures 115 on my hand held TDS meter I would assume your water would also not read really high out of tap. Really I don't think 1 or 2 is going to matter unless you are planning an sps dominant tank but this is my opinion. I know a person who has a successful sps tank using tap water here in Windsor. Not saying I would go that route but he is a very experienced reef keeper

 

[Bfofre]

Yeah I'm good with 1.. I was told  keep it under 5.  I just thought out of the ro it would be higher..

Sent from my SGH-I747M using Tapatalk

 

[Neopimp]

If you are using a TDS or conductivity meter to monitor the performance of an RO membrane, then the measured value should drop by at least a factor of 10 from the starting tap water. So, for example, if the tap water reads 231 ppm, then the RO water should be less than 23 ppm. In many cases, it will drop much more than that. Less of a drop than a factor of 10 indicates a problem with the RO membrane.

8. If you are using a TDS or conductivity meter to monitor the performance of an RO/DI system, then the measured value should drop to near zero. Maybe 0-1 ppm. Higher values indicate that something is not functioning properly, or that the DI resin is becoming saturated and needs replacement. However, that does not necessarily mean that 2 ppm water is not OK to use. But beware that it may begin to rise fairly sharply when the resin becomes saturated. Do not agonize over 1 ppm vs. zero ppm. While pure water has a TDS well below 1 ppm, uncertainties from carbon dioxide in the air (which gets into the water and ionizes to provide some conductivity) and the TDS meter itself may yield results of 1 or 2 ppm even from pure water.


From Here: http://reefkeeping.com/issues/2004-04/rhf/feature/index.php

 

[Bfofre]

If you are using a TDS or conductivity meter to monitor the performance of an RO membrane, then the measured value should drop by at least a factor of 10 from the starting tap water. So, for example, if the tap water reads 231 ppm, then the RO water should be less than 23 ppm. In many cases, it will drop much more than that. Less of a drop than a factor of 10 indicates a problem with the RO membrane.

8. If you are using a TDS or conductivity meter to monitor the performance of an RO/DI system, then the measured value should drop to near zero. Maybe 0-1 ppm. Higher values indicate that something is not functioning properly, or that the DI resin is becoming saturated and needs replacement. However, that does not necessarily mean that 2 ppm water is not OK to use. But beware that it may begin to rise fairly sharply when the resin becomes saturated. Do not agonize over 1 ppm vs. zero ppm. While pure water has a TDS well below 1 ppm, uncertainties from carbon dioxide in the air (which gets into the water and ionizes to provide some conductivity) and the TDS meter itself may yield results of 1 or 2 ppm even from pure water.


From Here: http://reefkeeping.com/issues/2004-04/rhf/feature/index.php

Thanks for the info... This would make sense...
I think my raw tap water is about 175ppm, so 2 ppm would be in the range of a "10" factor.
After the DI resin it is measured at 1ppm.  I have new DI resin, but think i will wait on changing it, as I am satisfied that everything is still functioning as it should be.

And btw this all from my Aquasafe RO/DI unit...  I've heard on here someone mention that these aren't effective units...I strongly disagree....  I've had steady success with them for this tank, and my previous tanks in the past...

 

[Neopimp]

Could be the td meter is off .  Could be that the di resin isn't packed in tight enough and there is leakage, could be tr way the wind blows. 


I really wouldn't worry about it at all lol


Sent from my iPhone using Tapatalk

 

[Bfofre]

I won't worry until I see  3ppm.. Then I know it's declining..

Sent from my SGH-I747M using Tapatalk