We clean our kettle after every brew with 2% caustic (Orica C4) at between 65C-80C for at least 40 minutes of recirculating through the spray-ball. Before we start the stainless is pretty decent looking - a few discoloured bits and some hop crud, but after CIP and rising the walls take on a brownish tinge and with the exception of some bright patches where the fixed spray-ball has hammered the walls it's far less shiny than before cleaning.
To remove this brownish deposit requires much hard labor with a #0000 3M scrubbing pad (non-scratching).
Re-causting the kettle softens this deposit and it can be removed with ease using the same #0000 scrubbing pad.
Nitrobrite (Orica nitric/phosphoric blend), does not remove this.
Is it our water? Protiens on the walls that are darkening from the heat of cleaning that were there all along? Something else? It's taking far longer and more cleaning chemicals that I think it should take to get our kettle and MLT as clean as I'd like between brews.
To remove this brownish deposit requires much hard labor with a #0000 3M scrubbing pad (non-scratching).
Re-causting the kettle softens this deposit and it can be removed with ease using the same #0000 scrubbing pad.
Nitrobrite (Orica nitric/phosphoric blend), does not remove this.
Is it our water? Protiens on the walls that are darkening from the heat of cleaning that were there all along? Something else? It's taking far longer and more cleaning chemicals that I think it should take to get our kettle and MLT as clean as I'd like between brews.
Comment