TDS meter... which to believe?

Ladybug5234 · Jul 13, 2020

I have an AquaticLife RO/DI with all filters and membrane changed on 7/1/20. I’ve collected maybe 20 gallons. I’m getting varied TDS readings and don’t know which to believe. I get zero TDS on the in-line probe, 6-11 with two different handheld meters if I collect water in a specimen cup and then off the charts if I collect in my brute container. I’ve heard of phosphates being elevated if water is left in a brute for too long but I’ve never heard of high tds. So which do I believe? (Keep in mind that all these filters are brand new.)

cvrle1 · Jul 13, 2020

When was the last time you calibrated your hand held TDS meters? TDS will jump up when placed in a container like brute from what I was told. I scared myself when I tested water in my container after a day or 2, it was really high. Was told it is normal, and only worry about TDS being actually 0 when coming out of RODI.

Ladybug5234 · Jul 13, 2020

cvrle1 said:
When was the last time you calibrated your hand held TDS meters? TDS will jump up when placed in a container like brute from what I was told. I scared myself when I tested water in my container after a day or 2, it was really high. Was told it is normal, and only worry about TDS being actually 0 when coming out of RODI.

They’re brand new, just got them last week, so I assume they came calibrated. How would I go about calibrating one anyway?

cvrle1 · Jul 14, 2020

Ladybug5234 said:
They’re brand new, just got them last week, so I assume they came calibrated. How would I go about calibrating one anyway?

Diy tds meter calibration

I think i need to calibrate my hm tds meter for my ro/di. New pack of dion resin is reading 005ppm, so it must be out. Can someone tell me how many g of salt in how much water? Here is what they say: http://www.tdsmeter.com/calibration_maintenance.html

www.reef2reef.com

Water Dog · Jul 14, 2020

Be sure that both your specimen cup and brute container are throughly rinsed and clean. If they are dirty, the handhelds will read measurable TDS from any contaminants in the present in the containers.