Patent ID: 6986356

Claim:
A method of preventing inadvertent consumption by a consumer of a material used for cleaning the flow lines of a potable liquid dispensing system, comprising: diluting an appropriate amount of concentrated caustic cleaning solution in water equivalent to diluting approximately one to two ounces of a concentrated caustic cleaning solution comprising approximately 15% w/v to approximately 30% w/v potassium hydroxide with a pH of approximately 10 to approximately 15 and a dye that remains in solution in a caustic cleaning solution having a pH of approximately 10 to approximately 15 in approximately one gallon of water resulting in a diluted caustic cleaning material containing a visible dye; introducing the diluted caustic cleaning material containing visible dye into the flow lines of the liquid dispensing system to clean the flow line; introducing a substantially colorless flushing liquid into the flow lines to flush the flow lines and remove any residual caustic cleaning material containing visible dye from the flow lines along with discharged flushing liquid; and continuing to flush the system with the flushing liquid until the discharged flushing liquid is devoid of any caustic cleaning material containing visible dye, indicating that no residual cleaning material remains in the lines to subsequently be dispensed with potable liquid and inadvertently consumed by a consumer along with the subsequently dispensed potable liquid.