Facility Design, Equipment, and Sanitation
Designing out contamination
Good layout separates clean from dirty and raw from ready-to-eat. Think in terms of flow: receiving, storage, preparation, cooking, cooling, plating, and warewashing should move forward without crisscrossing raw and cooked paths or backing up soiled equipment into clean areas. Surfaces must be smooth, durable, nonabsorbent, and easily cleanable; floors need coving, walls and ceilings must be intact and cleanable, and lighting over food and equipment should be shielded. Ventilation must remove grease, heat, and condensation so drips cannot contaminate food.
Plumbing is a favorite question area. Indirect waste and air gaps (at least twice the diameter of the drainpipe, never less than one inch) prevent backflow and backsiphonage into potable water. Handwashing sinks must be accessible, supplied with hot and cold water, soap, and single-use towels, and used only for handwashing.
Cleaning removes soil; sanitizing reduces microorganisms to safe levels. Chemical sanitizers need correct concentration, temperature, contact time, and pH; test strips confirm strength. A three-compartment sink follows wash, rinse, sanitize, and air-dry, and wiping cloths stay in sanitizer between uses. Mechanical warewashing relies on proper wash and final rinse temperatures or chemical sanitizer levels, verified with thermolabels or test kits. Food-contact surfaces used with time/temperature control for safety food must be cleaned and sanitized at least every four hours during continuous use.
Trap: quoting sanitizer concentration without temperature, contact time, or water hardness, or treating a high-temperature rinse as a substitute for cleaning. Rule of thumb: clean before you sanitize, verify with a test strip or indicator, and let items air-dry.