Our pool store offers the service of closing pools for the winter. I wanted to vacuum one last time (IG, vinyl liner pool) and I had just finished vacuuming when they arrived. Flustered, I forgot to backwash the DE filter. I remembered AFTER they had dropped the water level, blown out the lines, plugged up the returns, drained the equipment, put in the antifreeze, etc. Now I have a dirty DE filter that will sit all winter. Should I try to take apart the DE filter and clean it by hand? Will opening up the compartment let air back into the system and screw up everything that they just did? I've never done it before (this is our second year with a pool) but I am willing to learn!