madlynb
madtaz
Well, I took my first reading of my RO/DI water and it 728ppm. Is that good/bad?:question:
TDS reading of RO/DI water
- Thread starter madlynb
- Start date
daugherty
part time reefer
are you testing it after there is salt in it?
madlynb
madtaz
No salt
XxKnuckleheadxX
Reef enthusiast
thats very high! you on well water?
daugherty
part time reefer
yea that is really high. and that is after the rodi? if it is i think you have something wrong with it.
madlynb
madtaz
No, not on well water. I am going to clean out the barrel and add more RODI water and re-test. Thx for you input. Get back to you soon.
daugherty
part time reefer
check what the tds says on tap water. you may just need to recalibrate the tds meter.
madlynb
madtaz
I tested my other barrel of RODI water. That has a reading of 029. Is that better? I think the initial barrel had some salt residue in it from my last saltwater batch.
daugherty
part time reefer
that is a lot better but still high. my tap tests at 69-129 and out tests at 0-2
XxKnuckleheadxX
Reef enthusiast
my tap comes out at 50 and i test out at 0-1
XxKnuckleheadxX
Reef enthusiast
sounds like you need to calibrate your tester to me since your having high readings after it goes through...
daugherty
part time reefer
or change the DI media. it could be bad.
madlynb
madtaz
I believe I calibrated my meter before taking TDS reading. I put end of probe into the calibration fluid and set it to 769 which is the ppm needed for the temp of my water, 74 degrees.
I put some tap water into a glass. It read 180. The reading of 029 came from a brand new RO/DI 5 stage device.
I put some tap water into a glass. It read 180. The reading of 029 came from a brand new RO/DI 5 stage device.
sen5241b
Reef enthusiast
My tap is 150 tds and my RO is a 5. I believe the EPA limit for drinking water is 500.
XxKnuckleheadxX
Reef enthusiast
did you test the first few gallons? since your unit is new you need to toss the first few gallons...
madlynb
madtaz
I didn't toss the first few gallons. Will toss and try again. Thanks. Will get back to you once I test again.
daugherty
part time reefer
you should toss the first 3 or 4 gallons everytime if the water sits in the unit for very long it gets what is called TDS creap the numbers will rise just sitting there but after the water runs for a bit the TDS will drop back down.
madlynb
madtaz
But if I fill my barrel with water to prepare for my pwc and keep the flow in it with a powerhead or two will it still form TDS creep?
daugherty
part time reefer
no after the water is made it will not creap up. it creaps up in the unit itself
madlynb
madtaz
Oh, I am sorry for misunderstanding. So, the water that stays in my barrels will be okay if it sits for a while? If the unit itself isn't used like for a week or so, that is where the creep builds up. Okay, so each time I start up the unit after sitting I am to toss the first 3-4 gallons away. Got it!! Thanks again for your help.
