RO/DI Storage?

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NanaReefer

Well-known member
Joined
Jul 13, 2011
Messages
2,076
Location
U.P. of Michigan
I fill my 32g Brute up and test for TDS about every hour. End of filling I get 0 TDS.
Half way to empty I'm getting a reading of 001 at 3/4 I'm getting 002.
What's going on and is it bad to use this water?


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mfinn

Surgeonfish
Joined
May 31, 2004
Messages
6,901
Location
Olympia, WA
There might be a little residue from manufacturing, or cleaning.
I've seen this issue pop up from time to time.
Have you mixed saltwater in this container?
 

mfinn

Surgeonfish
Joined
May 31, 2004
Messages
6,901
Location
Olympia, WA
I cleaned out one of my salt mixing barrels (that I'd used for several years) as best as I could.
I filled it with ro/di for a friend whose ro/di unit broke.
When they came to pick up the water I grabbed my hand held TDS and stuck it in the barrel and it read 12TDS. I was shocked and embarrassed. I told them that I had good ro/di water and that it was 0, then that happened.
Then the guy asked me what this barrel was used for normally and I told him it was a salt mixing barrel and that when I realized that it picked some TDS from a tiny bit of salt residue.
 

NanaReefer

Well-known member
Joined
Jul 13, 2011
Messages
2,076
Location
U.P. of Michigan
I cleaned it out very well with vinegar before ever using. It has had nothing but RO/DI water in it. I'm thinking it's just picking up residue from my mixing pump ( face palm ) which I use to mix salt & transfer water to my ATO-oops! Dang these meters are sensitive!
 

dnjan

alveopora
Joined
Sep 9, 2003
Messages
1,585
Location
Seattle
I cleaned it out very well with vinegar before ever using. It has had nothing but RO/DI water in it. I'm thinking it's just picking up residue from my mixing pump ( face palm ) which I use to mix salt & transfer water to my ATO-oops! Dang these meters are sensitive!
Or you could just be having CO2 from the air dissolving in the water, which will increase conductivity and show up as an increase with a TDS probe.
 
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