My tds meter out of my RO/DI is reading 777 ppm. I have a 6 stage with an inline triple TDS meter. I just changed the battery and the cotton filter but for all outputs it still reads 777. Any idea why that may be happening
For a reading that high and consistent, it sounds like the meter may be bad.
Did it rise up slowly or just start reading high all of a sudden? If suddenly, it's unlikely an RO/DI unit that is producing < 1 tds all of a sudden starts producing super high tds water, even with a mechanical failure. These meters have poor precision in the high range and when actually reading high tds water, the value jumps around a lot.
I assume you get the same reading consistently across all 3 channels?
I would borrow a pocket tds meter and check the output. If it's low (< 1) then your meter is bad.
Thanks Matt. It just went high all of a sudden and it was the same reading across all three channels. I was able to borrow a pocket TDS meter and it showed the water being produced at zero ppm. So it looks like a bad meter.