Astralpool Aster Filter Ø 900 mm output 21/2″.The filters are manufactured with polyester resin and fiberglass. The highness filtering layer is of 0,8m, That gives a mayor quality of filtration than the residential filter this increases the capacity to withhold the little particles. Prolongs the time saturation filtration of the layers saving energy consumption, water consumption and chemical products. The filter can be used as a single layer or multi-layer combine sand with gravel, glass or anthracite. Fast opening lid. Sand drain of 2 1/2″ in the bottom part of the filter, optional sand drain d.200mm. Optional interior finishing with vinylester for ozone treatment.