First time closing and have a cartridge filter. I plan to connect my Cyclone to one of the skimmer or return fittings to blow out the lines. Question: do I drain the system first (open pump drain plugs, open filter drain plugs)? Also, do I remove the filter cartridges before blowing the lines? Going from the skimmer, the pressurized air will go through the filter (I don’t have a multi-port filter valve). Is it better to blow out the lines with or without the cartridges? My guess is remove them, but then the piping inside my Hayward filter is somewhat unsupported. Is that a problem? Thanks!