refractometer callibration ?

[mrsgoose]

Hi - I just got my refractometer and am gearing up to do some hypo for ich. The instructions say to use distilled water for callibration. I have RO water, can I use that or must it be distilled??
Thanks!

 

[drew2005]

Originally Posted by mrsgoose
Hi - I just got my refractometer and am gearing up to do some hypo for ich. The instructions say to use distilled water for callibration. I have RO water, can I use that or must it be distilled??
Thanks!
I have read here that distilled might be better. I have used both and mine calibrates the same with both. So i would say RO is fine.

 

[bang guy]

Distilled or RO/DI would be better than RO but the difference is so tiny that it's meaningless.
Just use the RO.

 

[mrsgoose]

great, thanks!