Some older cooling towers use wood slats supported on wire
or wood frames. These are very inefficient compared to today's modern
structured tower fills. The old, inefficient fills cause the water to fall
too rapidly through the tower, minimizing the evaporation rate and
consequently the temperature drop. Similarly, missing fill results in water
leaving the distribution boxes to fall directly and quickly to the tower
basin. The easiest way to spot fill problems is to look across the tower
basin for uneven water flow. The tower should look like a uniform heavy
rainstorm from this vantage point -- not a series of waterfalls.
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