TDS reading. Can this be right?

[jbird69]

Well Ive had my RODI unit for about 10 mo. I recently ordered replacement filters along with a digital tds meter. I have never taken a reading until today. I havent replaced the filters yet and heres what I read.

First I measure tds in one of my 7gal jugs of rodi topoff water. it read 060. hmmm. I decided to read water straight out of my tap. it read 040. mmmhmmmm. I grab a cup and fill it straight from my rodi filter. 002. ok, I go back to the jug and shake it real good. let it settle and take a reading. 821!!! What the #^%&!!? I dash to my 2 other 7 gal topoff jugs and take a reading. 004 and 006.
I purchased the replacement filters cause I have been increasingly fighting algae. Perhaps it is this jug that I should blame?
Would it be safe to say that I somehow got contaminants in that one jug? What would you do to clean it or would you toss it? Theres no smell to it at all.

Please help

 

[luther1200]

I would just get rid of it if it was me.

 

[jbird69]

well, a quick update on this. I decided to just dump the jug, rinse it with a gallon of "good" ro water and refilled it. Then tested...002. Maybe the jug is slowly leaching something, but I doubt it. I cant believe it would leach enough to kick the numbers up that high. My rodi unit is under my sink so I fill up in the kitchen....maybe my 15 year old dropped a slice of pizza in it or something, lol.

 

[TheH]

How long have you had the jug and has anything else been placed in it? Dust and dirt may have gotten in it.

 

[jbird69]

I bought all 3 jugs at the same time. same time I got my RO/DI unit. I never leave them empty. Whenever I empty one to fill up my ATO I refill it with fresh RODI. I did store freshly made up salt water in one of them for a few days. It has since been refilled and used many times over tho.

 

[Flipper62]

Do a TDS test on the water right after you make it. I use a COMM-100 portable TDS meter, Its the most accurate meter out there. If the water has a good TDS reading......its good to go.

Once the RODI water is exposed to air, or sits in a jug for a while, the TDS will change. This doesn't mean it's not good to use.

 

[redfishsc]

That almost sounds like it had kalk in it, especially when the TDS went through the roof when you shook it.....

 

[jbird69]

I took a reading of the new RODI water from "the" jug. It has now been in the jug overnight. It tested at 001. Pretty weird. I tested that thing 7 or 8 times yesterday, it was not an error reading. Definitly going to start measuring my tds in my jugs before adding them to my system.

Flipper, Are you saying a reading of 800tds isnt necessarily problematic?

redfishsc I have never used kalk. But I agree whatever it was mustve settled in heavy concentrate in the bottom of the jug.