The Upper Uvdal wastewater treatment plant was designed as a traditional chemical and biological treatment plant. In a polishing step, the effluent goes thru a filter bed with Filtralite Nature P before it is discharged into a small creek.

The filter bed with Filtralite Nature P has stable discharge levels far below recommended limits. After three years of operation, the treatment plant is removing 99 % of the phosphorus, with a discharge concentration of 0,06 mg/l.

Filter media used on the site  
1000 m3 Filtralite Nature P 0-4 mm
100 m3  Filtralite Nature NR 4-10 mm
100 m3  Filtralite Nature NR 10-20 mm