Astralpool Norma Filter 23.000 l/h Ø 1.000 mm outlets 90-75 mm Laminated filter in polyester reinforced with fibreglass (PRFV). Filtration bed can be of single or multilayer. Maximum working pressure 2.5 kg/cm2. Complies with DIN standard 19643/19605. Collector system with nozzle plate (0.5 mm slot). Fitted with sight glass, sand dump port, lateral manhole, pressure gauge and manual air vent and water purge. Top sand charge lid Ø 200 mm and manhole Ø 200 mm or Ø 400 mm according to model type. PVC and PP internal components. A4 bolts and EPDM gaskets. Options: Interior vinylester coating (resistant to ozone concentrations <0.4 ppm) and maximum temperature of 40ºC. Standard colour: Ivory.