salinity question

[sphelps]

Originally Posted by fishytime

well if you have an RO unit and are sure of the TDS, then maybe........but I wouldnt trust the store bought RO or the Culligan man for having a low TDS

Not to get technical but your refractometer measures salinity in ppt (parts per thousand) so even if your RO water was way out at 35ppm (parts per million) you'd still only be out by 0.035 ppt on your refractometer. Accuracy on a scale measured by your eye is equal to +/- half a mark which in the case of all the refractometers I've seen is 1 ppt, so you're refractometer even if calibrated perfectly is technically only accurate by +/- 0.5ppt. I wouldn't worry about that extra 0.035ppm, you couldn't even tell the difference when you calibrate it.