About a year ago I replaced our DE filter grids (Jandy DEV60 filter). A few weeks back I replaced the entire filter, due to a crack, with an identical Jandy DEV60 filter. I'd like to re-use the old DE filter grids as the new grids go bad. Any advice on how to store the old DE filters (wrap in plastic, leave unwrapped, store inside, store in outside shed, etc)?