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Convert SMS 913-A Keg Washer from Caustic to Acid cycles

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  • Convert SMS 913-A Keg Washer from Caustic to Acid cycles

    Good afternoon;
    Hoping someone has given this a try on their 3 head Specific keg washer.

    Want to switch to acid cycles on our Specific SMS 913-A Keg washer.
    Will be using mixed cultures, and would like to prevent cross contamination of brands.
    Cannot just keep "mixed culture kegs"; wish I could, but don't have the space to store them and it doesn't make sense to store empty kegs when I could use them for something else.

    Current Set up:
    I have a Beta pump unit that has two dosing pumps on it.
    One doses caustic into our cleaning reservoir.
    The other dose pump doses sanitizer to our kegs during a sanitizing cycle.

    We have a conductivity sensor in the cleaning reservoir that measures free ions...not sure if they measure hydroxide or hydrogen.
    I have been in contact with Specific, and I have not gotten a definite answer from them. They have said different suppliers of acid detergents may have different concentrations, so the conductivity probe may instruct the dosing pump to run...or not.
    I use AC-Special from Ecolab for acid washing my fermenters, which is an phosphoric/nitric acid blend...pretty light on the nitric.
    Would like to use this for my kegs as well.

    Specific has suggested I just shut off the power to the Beta dosing pump to the chemical reservoir side...
    This would then prevent any sanitizing cycle on the kegs, which I feel offers an additional step towards good a cleaned and sanitized keg.

    Has anyone cleaning kegs with acid on a Specific SMS 913-A 3 head keg washer?
    How strong of a concentration of acid have you used? I was thinking of 2% and above.
    Did varying strengths of the acid affect the conductivity probe to turn on/off the respective Beta dosing pump?

    Any help is appreciated.