Used Water Treatment Equipment 28 Water Treatment Equipment SEARCH. FILTER. ... with Enerquip heat exchangers, Fristam circulation and process pumps and Allen Bradley PLC controls. System has been remo more info... ADD TO CART VIEW ITEM. ... Used Parkson Dyna Sand Filter, Model 100SF. 400500 gpm. Feed TSS 2030 ppm. Effluent 25 ppm TSS.