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Water-borne film

The haze that appears after cleaning rather than before it. What is left behind when water evaporates is not dirt you missed.

In detail

A film that appears as a surface dries is deposited by the water rather than left over from the soil. The dairy cleaning guideline names four separate constituents that cause it and sets a maximum for each: total dissolved solids above 500 ppm, silica above 10 ppm, sulfate above 250 ppm, and copper above 3 ppm, which films and stains. The domestic signature is unmistakable once known. Glassware and shower screens that look worse immediately after washing, a haze that returns identically every time, and a mark that wipes away while wet and reappears on drying are all the same phenomenon: solids in the rinse water left standing on the surface. It matters because it is not a cleaning failure and does not respond to cleaning. The remedies are drying before evaporation, a final rinse in softer or purer water, or a rinse aid that breaks the sheeting so less water is left to dry.

Why

Sources for this page

Sources

  1. Dairy Processing Plants: Guidelines for the Cleaning of Dairy Plant Processing Equipment

    British Columbia Centre for Disease Control (BCCDC), Canada · Government or regulator

    Relied on for: That Table 4 sets maximum water concentrations of 500 ppm total dissolved solids, 0.3 ppm iron, 250 ppm chloride, 0.2 ppm manganese, 10 ppm silica, 3 ppm copper and 250 ppm sulfate, with the concerns filming, staining and corrosion. (states this directly)

    Verification: a person has read the passage relied on.

    Read on — Part II: 'Cleaning Steps' (Table 1), 'Factors Affecting Cleaning', 'Soil Characteristics' (Table 3) and 'Water Impurities' (Table 4). Supports the claim as stated. Supplies a soil classification by removal chemistry, the first numeric water-impurity thresholds in the register, and a professional cleaning protocol with a temperature for every step.

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