Aster laminated sand filters are known for their reliability, making them one of the top selling filters in the world, as well as for their collector arms, which feature a larger diameter for greater filtering surface. Fitted with an AstralPool multiport valve with 6+1 positions for filter, backwash, rinse, recirculating, waste and closed. A patented system is used for opening and closing the cover, thereby eliminating the use of traditional screws.