Citric acid passivation

[Jtvann]

I've read all about the concentrations and temps for various acids for passivation.

I'd like to use citric acid. Is it necessary to completely submerge for passivation, or will a constant CIP spray work.

It's easier to mix up 2 gallons and spray my 14g unitank than it is to fill 14 gallons.

Any thoughts?

 

[Vale71]

Contact times that you'll find in pulished standards are for full submersion ensuring costant and uniform contact. Using a spray ball would add an extra layer of uncertainty.

 

[Horseflesh]

It's not by the book, but were it me, I would give it a try.

 

[Jtvann]

Was trying to avoid having to use 5 lbs of the stuff for one fermenter. Like you said, I could try it. Results may not be as good, but it surely won't hurt anything and will be better than nothing.