Hondatek
Aquarium Advice Addict
Can you use tap water or does it have to be distilled or ro water?
That is the proper way to calibrate a refractometer.Everything I've read says you need to calibrate to 35ppt, that using ro/di or distilled is not an accurate way to calibrate.
Then it should be goodI'll still try to get some and see how much it changes. It was double checked at my Lfs with a digital refractometer so it should be acurate