Copatrawl™ technology is primary used for settled sewage, protecting travelling filter arms on rectangular trickling filters and improving the integrity of the works by protecting the filter arm sparge nozzles from blockages. The Copatrawl™ system applications have been improved to include screening storm overflows, storm tanks and final effluent.

The Copatrawl™ sac screening system provides screening down to 6mm with no moving parts, using re-usable trawl sacs. Used with Copatrawl™ technology, they can be made to fit into most sewage treatment applications, be it retrofit into an existing works or as part of a new scheme.

Typical installations include CSO installations and screening wastewater streams to trickling/percolating filter beds. Flow rate per sack is 150l/s per sack.

The Copatrawl™ system can be installed directly into the flow path of the fluid being screened. Solids are retained in the sac, therefore preventing downstream problems such as clogging of trickling filters or the pollution of surface waters following a storm event. The Copatrawl system is designed to screen much large flows than its sister product, the CopaSac® screening technology. Each Copatrawl sac can screen 150l/s.