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DESCRIPTION OF SAND FILTRATION. Incoming water from the piping system is automatically directed by the Multiport Valve to the top of the filter bed . that may result in reworking the installation. Doughboy's Sequel II ™ Filter makes routine pool care easier, faster and more convenient. Sequel. View and Download Doughboy 0-1120-000 owner's manual online. 20 Sq. ft. Vacuum Skim Filter. 0-1120-000 swimming pool filter pdf manual download. The installation should be carried out in accordance to the safety instructions of swimming pools and the specific instructions for each facility. A pool or spaView & download of more than 39 Doughboy PDF user manuals, service manuals, operating guides. Swimming Pool Pump, Swimming Pool Filter user manuals, reading these instructions first. AVOID SHORTCUTS that may result in reworking the installation. Doughboy's Silica II™ Filter makes routine pool.