hello
we've been noticing some dark rings forming inside our fermenters. (Non-organic build up of some sorts?)
we've tried some concentrated phos/nitric acid washes that seem to lighten up the stains but not remove them.
what is a good strong concentration to use?
Contact time?
Temperature?
we have some straight nitric acid, would that be better to try?
(i know its nasty)
thanks
we've been noticing some dark rings forming inside our fermenters. (Non-organic build up of some sorts?)
we've tried some concentrated phos/nitric acid washes that seem to lighten up the stains but not remove them.
what is a good strong concentration to use?
Contact time?
Temperature?
we have some straight nitric acid, would that be better to try?
(i know its nasty)
thanks
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