NEWA B Pressure filter Prexo adv. 30 Pressure filter for ponds. It consists of a tank with a capacity of 20/30 liters, filter elements, accessories and fittings. PREXO is equipped with the "Backwash" system (reversal of the water flow), which allows quick cleaning of the filter without having to open and dismantle it. Simply turn the knob on top of...