My RO/DI water straight from the unit is reading at 990ppm in TDS. I thought the meter might have been uncalibrated, but I recalibrated it and had the same reading. My tap water is reading at 175ppm. Is something wrong with my RO/DI unit? I replaced the filters a few months ago, but did not replace the membrane, could that be the issue? Im still quite new to saltwater so this is very new to me too.
Thank you in advance
Thank you in advance