TDS acceptable range?

[umbrellacorp]

Ive never bothered testing the RO water ive purchased in the past, but recently ive been having my issues. I just got a TDS meter and started testing. I purchased RODI water from two different LFS. One came up 77 and the other was 26. I asked how long ago they had changed the filters at the store with the 26, and they said about 4 months ago. The 77 came from a very well known and respected LFS so i couldnt believe it came out that high. Can the container im using effect the readings? Im guessing the best way to test is to bring a brand new clean plastic cup with me to the store and have them put some in and test then. Thoughts?

 

[jead85]

If that's their tds sounds like they are lying

 

[jbdreefs]

My tap water in gwinnett reads at about 40. I agree, I think those readings are awfully high...

 

[wbrown]

have you calibrated your meter? seems like it may be time to invest in your own RO/DI so you know what you are getting.

 

[schwaggs]

Yes, the container can contaminate the water but those readings seem very high. Either your container was very dirty or the places you are getting the water have defective RO systems. I would get my water elsewhere.

 

[heyitsmirix3]

Some salt left in the container can throw readings way off.

 

[izoid]

Did you ask them to test it there in front of you. You could at least see if they get the same results as you did and go from there.

 

[mvm]

Heyitsmirix3;717845 wrote: Some salt left in the container can throw readings way off.

Agreed. If you ever mixed salt in the containers, that's what's causing the high reading. When I test my RO, I always use a zip lock bag.

 

[oil_fan]

I use a plastic cup to test for TDS. One of those throw away types. Then I never have to worry if it had anything else in it.

 

[umbrellacorp]

MvM;717861 wrote: Agreed. If you ever mixed salt in the containers, that's what's causing the high reading. When I test my RO, I always use a zip lock bag.

Ok that would be why. All the plastic containers i use have had salt water in them at some point. I figured it had to be something like that. Thanks!


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