Swimables SW-26-400 FNS Style DE Filter ManifoldRestore Proper Water Distribution Inside Your DE Filter Inside every DE filter is a critical internal component responsible for evenly distributing filtered water back into the pool system. The Swimables SW 26 400 FNS Style DE Filter Manifold is a precision replacement part designed to restore proper internal flow within compatible Pentair FNS style DE pool filters. When a filter manifold becomes cracked, warped, or clogged, the entire filtration