Co2 industrial and food grade

[.AcroKiller.]

Randy can the impurities of the industrial grade co2 cause harm to stony corals?

And is it recommended to use food grade co2 ?

 

[Randy Holmes-Farley Verified Community Expert]

There may be trace pump oils in either one, but perhaps less (or at least testing to determine levels) in the food grade. I wouldn't generally be very worried about this, but I suppose a really crappy batch might put in enough oil to be an issue. I've not actually heard (that I can recall) of anyone tracing a problem back to a bad CO2 source for a CaCO3/CO2 reactor.

If cost were no different, I'd pick food grade. Since it will be more, I'd have to know how much more to decide if it is worth it.