Excessive algae growth in shallow settling ponds and large lagoon systems can result in elevated TSS levels and reduced effluent UV transmisivity. Blocking sunlight with a cover on the final settling cell prevents new algae growth and causes existing algae to die off and settle to the cell bottom.
An HDPE ball-type cover is a simple, effective method of covering settling cells. The balls automatically arrange themselves into a closely packed formation covering over 91 percent of the surface area.
The covers can also be used to prevent waterfowl from congregating on lagoons and ponds. Minimizing waterfowl reduces organic loading in the lagoons and bird fatalities in ponds where water may be toxic to wildlife. Ball-type covers are used extensively at or near airport locations to prevent bird fatalities to minimize the potential for aircraft bird strikes.