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The aim of this paper was to evaluate the sorption capacity of calcium based filter materials (Polonite, Filtralite P and Hyttsand) under Lithuanian conditions. The results obtained from 16 months long ditch filters investigations showed that the efficiency of tested filter materials varies from 60 to 30 % on the average. The filter material Polonite was distinguished by highest reduction capacity of phosphorus, slightly less reduction was determined using Hyttsand and the least using Filtralite-P. The monitoring results confirmed that ditch filters have some ability to the retention of phosphorus and water purification. In total, ditch filters adsorbed about 96–208 g total phosphorus (TP) and 20–124 g phosphate phosphorus (PO4-P) during the reporting period (January 2013 – May 2014).

COMPARATIVE EVALUATION OF DITCH FILTERS WITH PHOSPHORUS SORBING CALCIUM BASED FILTER MATERIALS