Local beer distributor that rents out jockey boxes has a couple small (2.5gal?) soda style kegs with sankey couplers installed on them, not sure where they bought them, but one is filled with PBW and the other with starsan, they just mix a batch up and run it through the lines, first pbw, which they bleed into the system and let sit for a bit, then rinse with water, and then starsan.
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