JSY-LF-AT 1¼" 8070573 Fluxo: 4.5m³/hr Largura: 230mm Time-controlled automatic backwash: Filter screen surface is cleaned three times during each backwasH Pre-selectable interval: 1 day, 1 week, 1 month, 2 months Buffer battery ensures the backwash is completed even in case of power failure Test unit for the buffer battery Plug-in power supply