... ,water amusement park, seawater, freshwater breed aquatics, industrial water treatment Filter shell made of fiberglass reinforced plastics, including pressure gauge, side ... multi-port 6-ways valve and air purge. Work pressure 2.5 kg/cm². Filtration ... (m2):0.8,0.94,0.97,1.3Welght of sand(kg):500,600,650,800 GOOD SAND FILTER