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Moutas
11-08-2017, 10:32 PM
Hello guys!

Yesterday we tried to clean the hot liquor tank, which we are using for 2 years now.

There are some brownish spots. We recirculated with caustic/acid for an hour and nothing changed.

Any thoughts?

UnFermentable
11-08-2017, 11:29 PM
Hello guys!

Yesterday we tried to clean the hot liquor tank, which we are using for 2 years now.

There are some brownish spots. We recirculated with caustic/acid for an hour and nothing changed.

Any thoughts?

Needs to be cleaner. I would try a nitric/phos blend first, drain with no rinse, and then a strong caustic cycle immediately after. 30 min and 30 min is usually long enough. You may need to get in it with a brush after the second cycle because it looks like a decent amount of build up, but it should wipe right off. Wipe down/brush before final rinse off with hot water.