... sand 0.5-0.8mmMaximum filtration velocity 50m3/h/m2Maximum water temperature 43 degree3.Technical Characteristics:Φ-350, ... ), 1.5’’/50mm(valve connections) 19.5 cbm/h(flow rate) 210kg(sand)...............Φ-700(B), 0.41 ... (filter area), 2’’/63mm(valve connections) 20.2cbm/h(flow rate) 215kg(sand)Φ-800, 0.50 sq ... meter(filter area), 2’’/63mm(valve connections) 24.9cbm/h(flow rate) 355kg(sand)Φ-700, 0.64 ...