... (valve connections) 15.6 cbm/h(flow rate) 145kg(sand)Φ-700, 0.40 sq meter(filter area), 1.5’’/50mm(valve ... connections) 19.5 cbm/h(flow rate) 210kg(sand)...............Φ-700(B), 0.41 sq meter(filter area), 2’’/63mm(valve connections ... ’’/63mm(valve connections) 24.9cbm/h(flow rate) 355kg(sand)Φ-700, 0.64 sq meter(filter area), 2.0’’/63mm(valve ...