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Removing PBW deposit on stainless

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  • Removing PBW deposit on stainless

    We have several tanks that are seeing a buildup or deposit (stain, even?) on the face of the tank, from repeated cleaning cycles using PBW. It's not bad on most of them, but especially prominent on our oldest brite tank (accompanied by a few rust spots, but that's probably a passivation discussion for another thread). I haven't yet tried anything, but someone had suggested a very mild ScotchBrite, followed by something like this spray for passivation after. Any thoughts or other suggestions? I'm still waiting to hear from the manufacturer of the tank but they are slow to respond, and I think at this point I trust this community more. Appreciate any help!

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  • #2
    Caustic.

    Brian from Loeffler Chemicals recommended their chlorinated caustic to me and it did the trick.

    Get a blue or white non-scratch scrubby pad and be prepared to spend a LOT of time. In the meantime, switch to caustic for CIP and never have this problem again.
    Mike Elliott
    Head Brewer
    Philipsburg Brewing Co.
    Montana

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    • #3
      If your water is very hard, or you add a lot of calcium salts to the mash, then this could be scale from the reaction of calcium salts with the detergent chemicals. It is possible that there simply aren't enough additives to keep the calcium salts in solution. A quick rinse with an acid detergent / sanitiser after the post detergent rinse will also help keep the plant clear of deposits.

      Alternatively, if the detergent is above 80 C then the caustic degrades and can cause deposits (not sure of the exact reaction, but I have been informed of this by Diversey, and have seen evidence to support this comment)
      dick

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      • #4
        Pbw

        Based on experience with hard water, Dick is spot on.
        PBW acts this way in hard water and also does not perform well or at all in hard water.
        I would be curious why Loeffler would not advise Acid 5 to remedy this quickly.
        Warren Turner
        Industrial Engineering Technician
        HVACR-Electrical Systems Specialist
        Moab Brewery
        The Thought Police are Attempting to Suppress Free Speech and Sugar coat everything. This is both Cowardice and Treason given to their own kind.

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        • #5
          A 5-10% phosphoric acid solution should do the trick. If you have rust problems also, a spray-on passivation should help with both, but will probably not do anything about the rust until the carbonate deposits are gone.
          Timm Turrentine

          Brewerywright,
          Terminal Gravity Brewing,
          Enterprise. Oregon.

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