EcoWater CHC Series, Service And Troubleshooting Manual, Page: 74 / 130

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of Silica may increase above the level of sustained solubility. At this level Silica can scale
out on the hot surfaces..
3. Frequent Cycling of Equipment. If the system pump is stopped before the heat has been
removed from heat exchanges, compressors, or other hot items, Silica scale can be formed
on the hot surfaces.
5.10.4 Ingestion Scale
Ingestion Scale is normal, if the environment has many forms of airborne debris that can be
ingested into the towers. This type of scale can look very rough and in many cases can look
like feathers or stalactites that hang onto the fill. You will also see ingestion scale on the
louvers or under the drip guards at the mist illuminators. The buildup on the tubes is normally
only on the lower tubes and are soft to the touch. They normally break very easily and can be
removed with a pressure washer under normal tower cleaning. If Ingestion Scale is found, the
use of alternate types of filtration may be warranted. Examples of Ingestion Scale forming
material: Concrete dust, sand, dirt as well as other airborne debris.
5.10.5 Overspray Scale
Overspray Scale is normal, if overspray reaches areas where there is not adequate water flow to
keep the surface clean. This light misting can evaporate and deposit its solids as a formation of
scale. This type of scale formation is normal and should be addressed during routine
maintenance
5.10.6 System Cycling Fill Scale,
If scale appears in the fill of systems where the pumps and fans are routinely cycled, water is
left in the fill, and as it evaporates, its solids will be deposited in the fill. To diminish this
effect, instruct the customer to leave the fans on for an additional five minutes after the pumps
stop to draw out any remaining water from the fill. This action will reduce the amount of debris
that will be available for scale formation.